I'm Swift and the visitor from Planet X by Victor Appleton II. CHAPTER I THE EARTHQUAKE Tom, we're having a problem with the gyro-stabilizer, said Mark Faber, gray-haired president of the Faber Electronics Company. Hope you can find out what's wrong! The 18-year-old inventor accepted the challenge with a smile. I'll be glad to try, sir," he replied. Bud Barkley, a dark-haired young flyer and Tom Swift Jr.'s closest friend, chuckled. If anyone can get the bugs out of your new invention, genius boy here will do it! The two boys followed Mr. Faber and his engineers to a wooden building which was tightly guarded. Inside, a secret rocket telemetering device was mounted on its test stand. "'As you know, Tom,' Mr. Faber began, the usual conditions of rocket-flight will be. He broke off with a gasp of astonishment as the whole building suddenly began to shake. "'Good grief,' Bud exclaimed. "'This isn't part of your testing routine, is it?' His question was drowned out by cries of alarm and the sound of cracking glass. The walls and roof were shuddering and creaking, and the concrete floor was heaving under their feet. "'Look out! The test stand's breaking loose,' Tom warned. Mr. Faber and two of his men tried frantically to brace the heavy test stand, which held the telemetering device. Another engineer rushed toward the door to see what was happening outside. Before he reached it, another shock knocked all of them off their feet. Electronic equipment cascaded from the wall-shelves and a heavy-duty chain hoist came loose from its overhead track, plunging to the floor with a terrifying crash. "'An earthquake,' Tom gasped. Bud meanwhile clawed a hand-hold on a wire screen enclosing an air compressor and pulled himself to his feet. By the next moment a third, more violent tremor rocked the building, knocking him over. "'The roof! It's caving in,' he heard someone scream. As his eyes flashed upward in panic, Bud caught a brief glimpse of the ponderous test stand with a priceless telemetre tilting to one side. An instant later it crashed over, pinning Mark Faber beneath it. Bud threw up his arms to protect himself, but too late. A falling beam caught him on the back of the head and the young flyer blacked out. For minutes no one stirred among the wreckage. Then Tom, who had been stunned by some falling debris, raised himself to a sitting position. "'Good night!' Tom's eyes focused in horror on the wreckage enveloped by still billowing dust. The sky was visible through several gaping holes in the roof, which was sagging dangerously on its supporting trusses. Only two-thirds of the walls were still standing. Suddenly Tom stiffened in fear. "'Bud!' the young inventor had just noticed his friend lying pinned beneath a heavy beam nearby. Was he still breathing?' Disregarding his own injuries, Tom hastily freed himself from the debris and groped his way to Bud's side. With a desperate heave he shoved the beam away, then cradled Bud's head in his arm. His friend's eyelids flickered. "'Are you all right?' Tom asked fearfully. The answer came in a groan. "'Oh, wow! What hit me?' "'You got conked by a falling timber, or grazed at least,' Tom added, thankfully. "'If that beam had landed square on your noggin, even a rockhead like you couldn't have survived.' Bud managed to grin. We grow him tough out in California where I come from,' he joked. Somewhat shakily, Bud got to his feet with Tom's assistance. Both boys were heartsick as they surveyed the damaged laboratory, wondering where to begin rescue operations. "'It was a quake,' Bud stated grimly. He had heard about the great San Francisco earthquake from his grandfather, and had no doubt about the nature of the tremors. Just then Tom glimpsed a body protruding from under the wreckage of the telemetering device. "'Mr. Faber!' he gasped. The two boys scrambled through the clutter of debris toward the spot where the test stand had been erected. Bud seized a slender, steel eye-beam and managed to pry up the wreckage while Tom carefully extricated Mr. Faber. The scientists seemed to be badly injured. "'We'd better not try to move him,' Tom decided. "'We'll get an ambulance.' Of the four other company engineers, two were now stirring and partly conscious. The boys found a first-aid cabinet and gave what help they could to them and the other two men. Then Tom taped a bandage on Bud's scalp wound. "'Let's see if we can find a telephone and call the local hospital,' Tom said. "'Right,' Bud responded. They picked their way through the wreckage and emerged on a scene of frightful destruction. The main plant building of Faber electronics had been partially demolished by the quake. Power lines were down, and an outlying storage shed was ablaze. Dazed and panic-stricken survivors were wandering around aimlessly or rushing about to assist the injured. "'Good thing the main shift of workers knocked off before this happened,' Bud observed with a shudder. There would have been a lot more casualties.' "'Look,' Tom pointed to a huge crevasse, right where we landed our whirling duck. The boys exchanged rueful glances as they realized that the craft which had brought them to Faber electronics, one of Tom's unique heligets, had been swallowed up in the gaping chasm. "'No use fussing about it now,' Tom said. "'Come on, Bud. Let's see about getting help for Mr. Faber.' Despite the chaotic confusion, the boys managed to locate the plant superintendent, a harried, middle-aged man named Simkins, who was doing his best to restore order. Simkins, who had not been injured, informed them that electricians were rigging an emergency telephone line in order to get through to the nearby town of Harkness. "'Mr. Faber is badly injured,' Tom said. "'Why not send a car? It's only a few miles away, isn't it?' "'I'll send the plant nurse to see him,' Simkins said. "'As far as going to town, take a look at the parking lot,' he pointed with a jerk of his thumb. The cars on the lot had been smashed into junk by bricks from a collapsing wall of one of the buildings. "'And the only truck we had available was in that burning shed,' the superintendent added bitterly. "'Tough break,' Tom sympathized. "'Anyhow, we want to help. Got a job for us?' Simkins was only too glad to put Tom's quick mind and keen technical know-how to use. Within minutes Tom was in charge of clearing away rubble and extricating anyone who might be trapped inside the buildings. Bud organized a firefighting crew to keep the blaze in the shed from spreading. The telephone line was soon repaired and a steady stream of rescue vehicles began arriving from Harkness, firetrucks, three ambulances, and private cars driven by volunteers. Two hours later there was nothing more Tom and Bud could do at the disaster scene and they hitched a ride into Harkness. The town had suffered some damage, though only slight compared to the destruction at the plant. "'The center of the quake was right under Faber Electronics,' Tom remarked. From a pay telephone he called Swift Enterprises in Shopton. This was the experimental station where he and his father developed their many amazing inventions. Tom asked the operator to send a helicopter immediately to pick them up. He also called home and spoke to his sister, Sandra. "'What a relief,' Sandy gasped. We heard a bulletin about the quake over the radio. "'Don't worry, sis. Tell mother and dad that we're OK,' Tom said. "'We'll be home in a jiffy, with big appetites.'" The helicopter arrived within twenty minutes at the place Tom had named. After landing at Enterprises the boys drove to the pleasant, tree-shaded Swift home on the outskirts of town. Mrs. Swift, a slender, petite woman, tried not to show concern when she saw the boys bruised and disheveled. "'I'm so thankful you're both safe,' she murmured. Blonde, blue-eyed Sandy, who was a year younger than Tom, had invited her friend Phyllis Newton to the house for dinner. Phil, a pretty dark-haired girl, was the daughter of Mr. Swift's long-time friend and business associate, Uncle Ned Newton. The two girls were as much upset as Tom's mother. Tom laughed. "'We're not stretcher cases,' he said. Why, one of the ambulance doctors checked us out.' Bud groaned. "'Why did you have to go and spoil it?' he complained jokingly. I was all set for Sandy's cool, soothing touch on my fevered brow.' Mr. Swift came into the living-room just then and told Tom how worried Mrs. Swift and Sandy had been. "'I tried to assure them that you and Bud can take care of yourselves in any crisis,' he smiled guiltily, as he added. "'But I must admit I was more than a little concerned myself.' As Tom grinned the resemblance between him and his father was very evident. Both had the same clean-cut features and deep-set blue eyes, although Tom, Jr. was lankier and taller. After the two boys had showered and changed their clothes, Mrs. Swift served them a delicious hot meal. While they ate, Mr. Swift managed, after some difficulty, to get a call through to the Harkness Hospital.  Hark Faber is not expected to live,' the elder inventor reported. A pity! He's a great scientist.' Tom nodded unhappily. Sandy, to take her brother's mind off the disaster, said, "'Dad, tell Tom and Bud about the visitor who's coming.' "'A visitor?' Tom looked at his father. "'From another planet,' Mr. Swift revealed. Both boys were amazed and excited. "'Wow!' Bud gasped. "'Male or female? Human or animal?' Mr. Swift's eyes twinkled. "'None of those,' he replied, as the boys stared mystified. "'End of Chapter One. Next episode, Chapter Two, The Mysterious Hitchhiker.' Tom and Bud were bursting with curiosity. Although the Swift's had been in radio contact with space for many months, this was the most exciting news yet. On one occasion the unknown beings had moved a small asteroid, the phantom satellite Nestria, into orbit about the earth. Later they had sent strange samples of the animal life of their planet, aboard orbiting missiles to be studied by the Swift's. They had also helped Tom, Bud and Mr. Swift a number of times when their lives were at stake while on daring voyages beyond the earth. What was their latest intention?' The telephone rang and Sandy went to answer it. "'For Pete's sake, Dad,' Tom pleaded, "'don't keep us in suspense. Who or what is this visitor?' Mr. Swift smiled at the boy's baffled expressions. The fact is that a message came through to-day that he was interrupted by Sandy who had come to the door. The phone calls for you, Dad, long distance, from Washington.' Bud groaned as Mr. Swift went off to take the call. "'It's a conspiracy,' Bud said. "'Everyone's ganging up to keep us from finding out about the mysterious visitor.' Tom grinned. "'We lasted through an earthquake this afternoon, pal,' he said consolingly. "'I guess we can last through a phone call.'" Inwardly, Tom was as impatient as Bud about the exact nature of the message. Several months ago, the space creatures had sent their first communication in the form of mathematical symbols carved on a black missile which had landed on the grounds of Swift Enterprises. Tom and his father had decoded the symbols and beamed out a reply over a powerful radio transmitter. Later messages had been picked up by radio telescope and converted to appear as symbols on the oscilloscope screen. "'Sandy must know what it's all about, Bud broke in. She's the one who first mentioned the visitor.' "'Of course I know,' Sandy said mysteriously. "'So does Mother, and so does Phil. But don't think we're going to give it away,' she added teasingly. Tom and Bud cajoled the two girls and Mrs. Swift for further information. But Sandy and Phil only shook their heads, obviously enjoying the situation. "'At last we're getting back at them for the way they've neglected us,' Phil said, her brown eyes sparkling with laughter. "'Come on, Mother,' Tom said. "'Be a sport. You tell us.'" But Mrs. Swift too shook her head. "'I'm sorry, Tom,' she demured gently. "'But I think the girls are right. "'I'll say this much, though,' she relented.  Bud remarked, as the two boys glanced at each other. "'That must mean it's plenty big news. It would have to be, Skipper, to top all the other jobs you and your dad have taken on.'" Conquering outer space, probing the ocean's secrets, drilling to the earth's core, these were only a few of Tom's Swift's many exciting exploits.  In his most recent challenge, Tom had defied the threats of Oriental killers determined to ferret out the secret of the Swift's latest space research. As the two boys silently recall the exciting events of the past months, Mr. Swift returned to the living room. Tom and Bud leaned forward in their chairs. "'Well, boys,' Mr. Swift said. "'As I started to tell you, the space receiver picked up a message today from our unknown planetary friends. The message informed us that they are sending a visitor to earth, a visitor consisting of pure energy.'" "'Energy?' Tom was startled. "'I don't get it, Dad.' "'Frankly, I don't quite understand it myself,' Tom Sr. confessed. "'The message didn't explain how or in what form the energy would arrive, but at any rate they wanted us to construct some sort of container for it.'" The elder scientist paused thoughtfully. "'In my opinion, the energy which they speak of must be a sort of invisible brain. The symbols were rather difficult to decode, but apparently our job will be to construct a device through which the energy will be able to receive impressions of what life is like here on earth, and also to communicate its own responses to us.'" Tom sat bolt upright. "'Dad, this is terrific news,' he exclaimed. "'If we are able to make this energy or brain communicate, it may be able to tell us what the space people are like.'" Mr. Swift nodded. "'His own eyes were blazing with as much excitement as Tom's were.'" Bud, too, was deeply impressed, but could not resist quipping. "'What sort of body will you give it? How about a beautiful super-intelligent space-girl for me to date?' "'Nothing doing,' Sandy retorted mischievously. "'I insist on a handsome young man who'd have time to take two nice earth-girls out on dates.'" "'Ouch!' Bud pretended to wince. I really left myself wide open for that one." Mrs. Swift put in. "'Goodness! Mightn't it get out of control and be rather overpowering? Suppose it went berserk.'" "'Rather an unpleasant possibility,' Mr. Swift agreed, smiling riley. "'But I trust our space friends wouldn't let that happen.'" Both he and Tom became thoughtful as they discussed the problem. "'The energy will arrive in two weeks,' Mr. Swift added. "'Unfortunately, that phone call was a request that I go to Washington on urgent government business. So you may have to take over and work out a solution on your own, Tom.'" It was a sobering thought to the young inventor. "'You are right, Mother. This is a terrific challenge.'" Soon afterward the little gathering broke up. Bud, who had left his own convertible at the Swifts that morning, offered to drop Phil at her home. Tom awoke the next morning, refreshed by a good night's sleep. After a hearty breakfast of bacon and eggs he drove off to enterprises in his low-slung silver sports car. "'Think I'll listen to the news,' Tom thought, and switched on his dashboard radio. A moment later the announcer's voice came over the loudspeaker. "'Casualties from yesterday's disastrous earthquake now total thirty-one injured,' the announcer reported. "'Most of these are employees of the Faber electronics plant and four are in critical condition. There is one note of cheer, however. At last report, Mark Faber, the brilliant president of the company, is now expected to recover.'" Tom gave a thankful sigh of relief. The announcer continued, "'The nearby town of Harkness was only lightly damaged, but the plant itself was almost totally demolished. No estimate of the losses has been released, but will certainly run into millions of dollars, including some highly secret defense items which were being developed at the plant. Scientists are puzzled by the severity of the quake in what had been considered a dead area.'" The first time Tom, too, was struck by this curious aspect of the disaster. So far as he knew, no serious tremors had ever before been reported within hundreds of miles of the region. He was mulling over the matter as he drove along a lonely wooded area, not far from Lake Carlopa. Suddenly his thoughts were interrupted as a man stepped out from among the trees ahead and gestured with his thumb for a ride. "'Sorry, mister,' Tom reflected, but I've had trouble with hitchhikers before." He shook his head to let the man know that he did not intend to stop. To the young inventor's amazement, the pedestrian deliberately stepped onto the road, squarely in the path of Tom's oncoming car. Tom jammed on the brakes, and the silver sports car screeched to a stop. Only a quick twist of the wheel had prevented an accident. Somewhat angrily Tom exclaimed, "'What's the big idea, mister? Don't you realize you might have been?' "'Shut up!' the stranger snarled. In an instant the man had yanked open the door and climbed in beside Tom. "'Take me inside the grounds of swift enterprises,' he commanded in a foreign accent. "'And no tricks, or you will regret it.'" End of chapter 2 Next episode, chapter 3 Report from Interpol Tom Swift and the Visitor from Planet X by Victor Appleton II Chapter 3 Report from Interpol Tom, astonished, stared at the stranger. "'Who are you?' the young inventor demanded. "'Never mind who I am. Just do as I say.'" By this time Tom had recovered from his surprise and coolly sized up his enemy.  Tom wondered, should I risk a fight, or is he armed? As if in answer the stranger growled, "'I gave you an order, my friend. Don't press your luck. Get going.'" As he spoke the man thrust one hand deep into his coat pocket and Tom felt something hard poke against his ribs. The young inventor drove on, but proceeded slowly. He wanted time to think. Presently Swift Enterprises, enclosed by a high wall, came into view. Tom's brain was working fast. At last he decided on a ruse. He would head for the main gate, get out, and use his electronic key without waiting for the guard to admit him. At the same time he would press a secret warning bell to alert the Swift Security Force. But the stranger seemed to read his thoughts. As Tom started to turn off toward the main gate, his passenger snapped, "'Go to the private gate which you and your father use.'" "'And if I refuse?' Again the hard object poked into his ribs. "'You will be what you call in this country a dead duck,' the stranger warned. "'I will then let myself in with your key.'" Tight-lipped Tom drove on another half-mile, and turned in at the private gate. The man got out with him as Tom walked up to the gate and beamed his electronic key at the hidden mechanism. Instantly the gate swung open, then closed again automatically after the car passed through. Tom parked in his usual spot. The stranger kept his hand in his pocket, still covering Tom, but glancing around cautiously. The sprawling experimental station was a vast four-mile square area with a cluster of gleaming modern laboratory buildings and workshops. In the distance a tall glassed-in control tower overlooked the enterprise's long runways for jet planes. Suddenly the stranger stiffened. A ponchy, bow-legged figure topped by a white Texas sombrero was coming straight toward them. Tom's heart gave a leap of hope. The man was Chow Winkler, formerly a chuck-wagon cook and now head chef for the Swift's Expeditions. "'Ha-ha, boss!' Chow bellowed in his fog-horn voice. As usual he was wearing a gaudy cowboy shirt. "'Who's the new buckaroo?' the cook added, squinting at the stranger with open but friendly curiosity. "'Why, actually, I don't know his name yet, but he's looking for a job,' Tom replied. Turning to the stranger he added, "'What is your name, Mr?' Chow's eyes narrowed. He had detected something strange in the way Tom addressed the fellow as Mr. and had also noticed how the man kept one hand hidden in his pocket. Looking to Tom for a lead, Chow suddenly noticed the young inventor make a quick thumbs-down gesture. "'My name is,' the man's voice fell to a mumble, obscuring the syllables. "'Frankly, I am not yet sure I desire a job here, but, being an engineer, I thought perhaps.' The man's gaze switched back to Tom, and in that instant Chow jumped the intruder. With surprising agility for his rotund bulk the cook bored down on him and let fly a gnarled fist at the stranger's jaw.  He was clutching a snub-nosed automatic. Tom twisted it from his grasp as the man landed, writhing on the hard ground. Chow quickly pinned his other arm and drove a knee into the man's solar plexus.  He stopped my car on the road and forced me to drive him in through the private gate. Boy was I ever glad to see you, old timer.' Tom emptied out the clip of shells. Then he searched the stranger while Chow continued holding him down. The man carried no wallet, papers, or other means of identification. "'Brand my tumbleweed salad,' Chow grumbled. He sure wasn't taking no chances on people finding out who he is. Which proves he's some sort of crooked cowpoke. Honest ones ain't afraid of showing their own brand.' The man muttered something angrily in a foreign tongue. Chow merely pressed down harder with his knee. "'What'll we do with him, boss?' "'Let him up, Chow,' Tom said. "'Security should be here any second.' Even as he spoke, Tom glimpsed a jeep speeding toward them in the distance. The young inventor knew what had happened. Since the stranger did not have the special electronic wrist amulet worn by all swift employees, his presence had automatically shown up on the master radar scope. A security squad was coming to investigate. As Chow released the man, he got to his feet slowly. Then, without warning, he suddenly butted the cook square in the stomach. Chow was knocked sprawling. Before Tom could counter the surprise attack, the man's fist cracked against his cheekbone. Tom, though stunned, lashed out. More punches flew back and forth. Tom landed a stinging blow to his opponent's midriff, then took a punishing one himself. Suddenly Tom felt the stranger's hand clawing at his pocket for the key to the gate. With all his wiry strength Tom locked his arms around the man and wrestled him to the ground. The stranger fought like a tiger. But a second later a jeep screeched to a stop. Three security guards, led by stocky Phil Radner, leaped out. Within moments they had the man subdued. Tom quickly briefed the security men on what had happened. All right, mister, start talking, snapped Radner, head security police officer. The man's only reply was a scowl of rage. Okay, take him away till he cools off, Tom ordered. Dyshevelled and still panting, the man was bundled into the jeep and driven off to the security building. Tom arrived there by motor scooter several minutes later. Harlan Ames, the slim, dark-haired security chief of enterprises, had taken charge of the case and the prisoner was now being fingerprinted and photographed. Any leads, Tom inquired? Ames shook his head. He won't talk and we've nothing on him in our files. His clothes have no tags or laundry marks, but I'd say they're a foreign make. Tom nodded. He's definitely foreign. He spoke with an accent and he also muttered something at Chow. I didn't catch it, but it certainly wasn't in English. Ames frowned. I don't like the looks of this, Skipper. He may be a spy. Have you notified the police, Tom asked? Right, also the FBI. They're on the way right now to pick him up. Maybe they'll be able to worm something out of him. Tom spent the morning in routine work in the big double office which he shared with his father in Enterprise's main building. It was equipped with huge twin modern desks, deep pile carpeting and roomy leather chairs. Each of the two inventors had his own drawing board designed to swing out from the wall at the press of a button. Small-scale models of some of their most famous inventions were also placed about the office, including a red and silver replica of Tom's first rocket ship, the Star Spear, a blue plastic model of the jet marine in which he had fought a band of undersea pirates, and also a gleaming silvery model of Tom's latest, unique spacecraft, the Cosmic Sailor. Because of his father's absence in Washington, the burden of administering the vast experimental station now fell on Tom's youthful shoulders. Telephone calls, letters, and other detailed work occupied him until noon. Chow broke in, bringing a lunch tray with milk, a hot chicken sandwich, and a chocolate eclair. Tom ate hungrily. "'Kinda peps up the old supercharger, eh?' said Chow, lingering to chat. "'Sure does,' Tom agreed. "'Well, just remember that. Don't go missing any meals or sleep either.' Chow advised as he gathered up the tray. "'A brainy young ombre like you needs plenty of rusted vitamins to keep from burning himself out.' "'I'll remember,' Tom grinned affectionately as the leathery-faced old Texan took his leave. The Swifts had first met Chow when they were on an atomic research expedition in the Southwest. Chow had become so attached to Tom that he had returned to Shopton with the Swifts as a permanent employee. Soon after Chow left the office, the telephone rang. Tom took the call and had just finished talking with Harlan Ames when Bud came strolling in. "'Anymore news on that nut who jumped you this morning?' the young flyer asked. Ames told me about it. "'Not yet, but there may be soon,' Tom said. Harlan just phoned and said he'd had a call from Washington, asking us to stand by the videophone at 1.30 sharp. Ames arrived in person shortly before the scheduled time. Moments later a red signal flashed on the control board of the Swifts' private TV network. Tom flicked on the videophone and two men appeared on the screen. One was Blake, the Swifts' Washington, D.C. telecaster. He introduced the other man, a calm-faced, balding individual in a dark suit. "'This is John Thurston of the Central Intelligence Agency, Tom,' Blake said. "'He thought it might be better to discuss this with you face to face.' Tom, Bud, and Ames were also visible to the pair in Washington. "'Glad to know you, sir,' Tom said and introduced his companions. "'We've identified the man you captured this morning,' Thurston began. "'He's in the United States on a French passport under the name of Jacques Reynard. "'But we've just learned from the International Police Organization that he's actually a Brungarian. His name is Samson Narco.' Tom and Ames exchanged startled glances. In the past, certain Brungarian factions had been responsible for some of the most fiendish plots ever perpetrated against the Swifts. "'Unfortunately, that's not all,' Thurston went on. Thurpole also believes that Narco is also a member of the same rebel outfit with whom you've had trouble before.' Tom was dismayed by the news. "'I sure thought that group had been smashed,' he said. Soon after Tom had balked their attempts to seize the satellite Nestria, the rebel ringleaders had reportedly been arrested and tried for treason. "'It now appears,' Thurston explained, that only one segment was quelled. Other members of the anti-government movement are active again and are said to be strongly organized.' The CIA man related even more sinister news. It was suspected that a larger nation, by aiding the rebels, was planning a coup to take over Brungaria. They had already subverted various government agencies and were sending their own professors to staff the Brungarian technical schools. It was all part of their insidious fifth column pattern. "'Many top Brungarian officials have joined the plotters,' Thurston added, and it's now becoming very difficult for anyone to enter or leave the country.' Ames asked for information on any rebel sympathizers known to be in the United States. Thurston was able to tell him very little. "'We keep strict tabs, of course, on all Brungarians entering this country,' Thurston explained, but even though we screen them carefully, a rebel agent like Narco may slip in, usually on a stolen or faked passport.' When the telecast ended, Tom, Bud, and Ames discussed the news grimly. "'What if Narco has pals working with him?' Bud conjectured. "'If he does,' Tom said, they may try carrying through Narco's mission.' "'I'll station extra guards around the outer wall on 24-hour alert,' Ames promised. Tom approved this measure wholeheartedly, but the purpose of Narco's secret mission remained a mystery. Why had he tried to force his way into enterprises? What was he after? There was little hope of resolving these questions since United States intelligence had learned of the rebel movement itself only within the past few days. Thurston had asked Tom and his companions to treat the information as confidential. "'I'd better get back to work,' Tom decided, after Bud and Ames had left his office. Tom sat down at his drawing-board and began to sketch out some rough ideas for a vehicle to house the brain energy from space. Tom wondered if the brain would be able to perform actions itself given the proper mechanical output devices. Or would he have to help it function via an electronic computer to digest incoming information or stimuli and then to respond through servo-controls? The problem was so baffling and complex that Tom became completely oblivious to the passage of time. He sketched out plan after plan only to crumple and discard each one. Suddenly a disturbing thought jarred the young inventor out of his concentration. Perhaps the Brungarian rebel scientist had now figured out how to decode the radio messages from the Swift Space Friends. If so, when the brain energy was launched toward Earth they may try to divert it to their own receiving setup. Chapter 4 Another Tremor Tom Swift and the Visitor from Planet X by Victor Appleton II This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer visit LibriVox.org Chapter 4 Another Tremor Tom was appalled at this new danger. During his drawing board back into its wall slot the young inventor hurried to his desk and made a number of telephone calls. Within minutes a group of five of his most trusted associates had assembled in Tom's office. First to arrive were Bud Barkley, Ames and George Dilling, the Swift's communications chief. They were joined moments later by Hank Sterling, the square jawed chief engineer and troubleshooter of enterprises, and Arvid Hansen. Hansen, a hulking six-footer, made all the delicate-scale models of Tom Junior's and Tom Sr's inventions. He was not only an expert craftsman, but, like all the Swift's keen men, a trained aircraft and space pilot as well. What's up, Skipper? Bud asked. I guess you might call this a Council of War, Tom replied. He divulged his fears that Brungarian scientists might hijack the brain energy to be sent from Planet X, home of the Swift's unknown space friends. Bud, you recall Mother's remark last night about the danger that this energy may prove overwhelmingly powerful, Tom went on. Well, just suppose that our Brungarian pals fitted out in robot form, then turn it loose against us or our friends in other countries. Bud gave an odd whistle. Boy, a thing like that might make even a powerful missile look like a toy. Even if the brain energy proved too small to be harnessed for destructive purposes, Tom went on, it might turn out to possess super-intelligence. Gifted with all the scientific know-how of the space people, it might be made to reveal those secrets to the Brungarians. They might learn from it how to construct weapons or spacecraft powerful enough to conquer the free world, Tom ended. His listeners were grim-faced at the thought. I'd say that's a far worse danger than any chance of their coming up with a robot monster, Aime said. Ditto, Hanson agreed. I think so too, Tom replied. In any case, it's up to us to make sure the Brungarians don't switch that energy off course before it lands here. Think their scientists are capable of such a stunt? George Dilling inquired. Tom shrugged. They're certainly far advanced in the fields of rocket guidance and telemetry, but actually we just don't know. Hank Sterling glanced hopefully at the young inventor. Got any ideas, Skipper? He asked. Tom drummed a pencil on the table thoughtfully before replying. Maybe our best bet is first to find out all we can about the lines of research on which they're concentrating. That might be a tip-off. After a thorough discussion it was decided that Aime's and Dilling would fly to Washington at once and talk to the FBI and Central Intelligence. Their job would be to garner and piece together every scrap of information on Brungarian scientists' accomplishments. Let us know as soon as you get a general picture, Tom said. Aime's and Dilling promised to do so and the meeting broke up. Feeling somewhat reassured now that a definite plan of action had been decided upon, Tom resumed work on his sketches. Although both the problem and the solution were still hazy in his mind, a few ideas began to take shape. A radio antenna would certainly be needed to receive or transmit signals at a distance. And repellentron units would give the brain a way to exert force when it wanted to act. These were devices which Tom had invented to produce a repulsion force ray. He had used the principle in both air and space flight. A power plant might also be needed to generate additional energy in case the brain's own energy was very small. Lastly, there would have to be a control system for use either by the brain itself or by its human operators. After an hour of work at top speed, Tom was rather pleased with one rough sketch. He was mulling over the idea when Chow Winkler and Bud Barkley wandered into the office. Both were impressed when Tom explained the sketch. Chow stared at it, goggle-eyed at the thought of such a contraption coming to life. So that's the old think-box, eh? he muttered. Tom laughed. Good name, Chow! All three were startled as a voice suddenly broke in over the wall intercom. It was the operator on duty at the plant's communication center. Turn on your TV, Skipper," the operator suggested. We've just had a news bulletin that an earthquake tremor has been felt over in Medfield. There's a big plant there that makes rocket-nose cones. A mobile TV crew's been rushed to the scene in a helicopter and they're trying to pick up the action with a television camera. Good night! Another quake! Bud gasped. Tom had already rushed to the videophone. Flicking it on, he switched to a commercial channel. Soon a picture appeared on the screen. It was a panoramic shot of a landscape evidently viewed from a hovering aircraft with a large industrial plant just below. A TV commentator's voice was reporting developments. Few visible signs of a tremor, he said. As you can see, the rocket-plant personnel and the people of Medfield are making desperate attempts to evacuate. Fortunately, most of them have already left the immediate area. A few cars and trucks could still be seen speeding along the ribbon-like roads within view of the hovering television camera. Oh! Oh! The commentator's voice broke in again. Notice that tall stack just over the plant. See how it's starting to tremble. It's beginning to crumble. This must be it! Suddenly the whole scene seemed to explode. Plant buildings collapsed like toy houses built of cards, while at the same time huge rocks and trees were uprooted as a yawning crack opened to the ground below. The three watchers in Tom's office stared in horrified dismay. But a moment later the picture on the TV screen became jerky and distorted, then faded out completely. After a brief interval a studio announcer came on. The relay transmitter must have been knocked out by the quake. We return you now to our regularly scheduled program, but we'll keep you informed as bulletins come in. Great balls of fire! Chow gulped as Tom turned off the set. I sure hope all the poor folks in cars got away safe. Tom rushed to a wall shelf and pulled out a book on geology. He leafed quickly to a section dealing with known earthquake faults and the distribution of quakes. When he looked up at the others his face was grim. What's wrong, Skipper? Bud asked tensely. That quake, Tom replied, wasn't in a patterned zone any more than the Faber one was. Chow's jaw dropped open in a comic look of dismay. You mean this hero earth we live on is getting all busted up and twisted around inside? I wish I knew, Chow. Tom paced worriedly about the office. It just seems queer to me that both of those quakes should have destroyed vital defense factories. On a sudden impulse Tom snatched up the telephone. His two companions listened as he put through a call to the FBI in Washington. Within moments a friend at the Bureau, Wes Norris, came on the line. Look, Wes, Tom said. Is there any chance this quake that just happened at Medfield and the earlier one at Faber Electronics might have been caused by underground H-bomb blasts? As a matter of fact we're checking on that very possibility. Norris replied. In other words, sabotage. Things are pretty hot around here since that news on Medfield came in so I can't talk much right now, Tom. But I can tell you this, Wes concluded. We are investigating and I do mean thoroughly. Bud and Chow were shocked when Tom reported his conversation with the FBI agent. Brand by rattlesnake stew! Chow exploded. Any ordinary vomit that had caused an earthquake ought to be strung up like a house thief. I agree, Chow, Tom said. But how do we find out for sure? After closing time with the plant, Bud drove home with Tom. Both Mrs. Swift and Sandy were upset as the boys discussed the situation. Tom, if this was deliberate, Mrs. Swift pointed out, enterprises may be next on the enemy's list. Tom did his best to allay his mother's fears, but inwardly he himself felt apprehensive. Any large-scale sabotage plot would be almost certain to include Swift Enterprises, America's most daring and advanced research center. When his mother went upstairs to her room, Tom suggested to Bud that they drive out to the nearby state police post. Here he confided his fears to Captain Rock, an old friend of the Swift's. You have some request in mind? Captain Rock inquired. How about making a search for any signs of suspicious digging or underground activity in the vicinity of Shopton? Tom said. There would have to be an excavation of some sort in order to set off an underground blast. Captain Rock mulled over Tom's suggestion. Sounds like a big job, but I'm afraid you're right, Tom. We can't risk a similar disaster here. We'd better move fast, too, Bud put in. Those two quakes so far came only a day apart. Rock picked up the telephone and barked out orders. Within half an hour several carloads of troopers were covering the outlying roads that converged on Shopton. Firemen and Chief Slater's Town Police Force were also pressed into action. They would search every cellar in town for signs of recent digging. Bud rode in one police car and Tom in another as a house-to-house search was conducted along the highway that ran past Enterprises. At one weather-beaten house, where Bud stopped with a state trooper, an old man came to the door. What you fetters prowling around for, he asked. Bomb emergency, the trooper said leconically. We have orders to search every house cellar for underground openings. Grumbling, the old man let them enter. He followed them down a rickety stairway. A moment later Bud stumbled and gave a yell. The trooper swung around, just in time to see Bud drop from view. End of Chapter 4 Next Episode Chapter 5 Secret Cache Tom Swift and the Visitor from Planet X by Victor Appleton II This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, visit LibriVox.org Chapter 5 Secret Cache As the trooper's flashlight stabbed through the cellar gloom at the spot where Bud had disappeared, there came a loud splash. The light showed a round hole in the floor, rimmed by a low circle of brickwork. What's that hole? The trooper snapped at the owner. What does it look like? The elderly man snapped back. It's an old well. A well? The trooper exclaimed as he rushed to the spot and not even covered. What are you going to do, kill people? The old man sniffed. Used to be covered, but the lid's gone. Didn't expect to have a bunch of nosy feathers poking around down here. The state trooper muttered angrily under his breath as he shone his flashlight into the well shaft. Bud was splashing around below, soaked and chagrined by his accident. Give me a hand up! He called up. The trooper reached down and was barely able to reach Bud's fingertips. To make matters worse, the sides of the well were slippery with moss. Get a rope, the trooper ordered the old man. Ain't got one! The policeman reddened and stood up to his full six-foot-two. Look, mister, what's your name? The elderly man shrank back, as if suspecting that the trooper's patience might have been tried too far. Ben Smith, he mumbled.  Ben Smith gulped on his chewing tobacco and hurried off. A minute or so later he returned with a length of clothesline. The trooper lowered it into the well and Bud was soon climbing out, looking like a drenched rat. Sorry, son, Smith said apologetically. Guess I should have warned ya. Bud chuckled good-naturedly. It's all right, he said. It was my own fault for not watching where I was going. Besides, you can't blame an American for not liking the idea of having his home surged. The old man chuckled too and flashed a wary eye at the trooper.  Meanwhile, Tom was investigating a house down the road with another state trooper. The owner, a ponchy, unshaven bachelor named Pete Laddie and his 17-year-old nephew accompanied them to the basement.  Most of it was covered with dust, but Tom noticed a large packing crate that looked as if it had been freshly moved. He walked over and began to shove the heavy box aside. What are you doing? Laddie asked, gruffly. I want to look underneath," Tom replied. A second later his eyes widened as he saw a trapped door, evidently leading to a sub-seller. Tom beckoned his partner over and showed his discovery. Where does this lead to? The trooper asked, turning back to Laddie. Just a little storage place? The owner replied with a shrug. I didn't think it was worth mentioning. You better not go down there," he added hastily. The steps ain't safe. Just the same, we'll take a look," the trooper said. Then do it at your own risk," Laddie snapped. The officer pulled up the trap door and Tom shone a light down. The shallow dirt-walled room below was about six feet square. On the floor, at the foot of the short rickety ladder, lay a large bundle wrapped in a tarpaulin. Tom descended the ladder cautiously and opened the tarpaulin to see what was inside. The contents made him gasp. A large, well-oiled collection of rifles and pistols. Looking up, Tom saw both the state trooper and Laddie peering down at him. The trooper opened mouthed with surprise. Laddie scowling nervously. Don't touch him, Laddie warned. Some are loaded. I keep them hidden for safety, but sometimes my nephew Fred here and I have target practice. Just then Tom's keen eyes spotted a slip of paper tucked among the guns. He pulled it out. His heart gave a leap of excitement as he saw two words written on the paper. Samson Narco. Hiding his amazement, Tom read the name aloud and added casually, What's this? The make of one of your guns? Oh, yeah, that's right," the man replied. Without comment Tom climbed out of the sub-seller. As he bent down to drop the trap-door, Tom flashed the officer a signal. Instantly the trooper grabbed Laddie. Hey! Why the rough stuff! the prisoner exclaimed.  He pulled free from the trooper's grasp and bolted toward the stairway. His nephew stood as if paralyzed at the sudden turn of events. Laddie's attempt at flight was hopeless. Tom quickly brought him down with a flying tackle. Later, after Laddie had been manacled, Tom helped him up. In case you don't know it, the young inventor said coldly, Your friend Narco is in jail, so you might as well talk. What's the pitch? Laddie was trembling and still pale. Hey! I didn't know there'd be any trouble with the cops, or I'd never have done it," he quavered. Narco offered me some dough to hide the guns. I needed money, so I took him up. That's all there was to it. How long have you known this, Narco? Tom asked. I met him a few days ago in a restaurant. Believe me, I'd never laid eyes on him before, and I wish I'd never had," Laddie added bitterly. The man's story had a ring of truth. All right, officer, let's take him in, said Tom. To the still astounded Fred, he added, We're sorry about this. Two hours later, Tom and Bud sat in Chief Slater's office at Shopton Police Headquarters. Captain Rock and the Shopton Fire Chief were also on hand. We've had troopers, detectives, and fire inspectors swarming all over Laddie's place, Captain Rock reported. They examined his house, the garage, two sheds out back, and every inch of the grounds. But there's no indication of any place where a bomb might have been planted to cause an underground explosion in Shopton. The Fire Chief nodded confirmation. So that clue peters out, he said. With the waning of daylight, the other groups had finally abandoned their search at the Shopton area without turning up any information. I'll notify the FBI immediately, Chief Slater said. Nevertheless, he promised that his men would continue their efforts the next day. Even if we find nothing more, that arm's cash was worth all the trouble, Slater added. The country owes you a vote of thanks, Tom. A bunch of enemy agents could have heard a lot of people with an arsenal like that. That's for sure, Captain Rock agreed. It was a good day's haul, Tom. The two boys drove back to the swift home and had a quick shower. Bud borrowed clean clothes from Tom. Then they sat down to enjoy a warmed-up but tasty supper served by Sandy and Mrs. Swift. As they ate, the boys listened to music on the radio, interspersed with eager questions from Sandy about the bomb search. Suddenly the radio announcer broke in. We interrupt this broadcast to bring you an important news bulletin. End of Chapter 5 Next episode, Chapter 6 Brungarian Coo Tom Swift and the visitor from Planet X by Victor Appleton II This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, visit LibriVox.org Chapter 6 Brungarian Coo Tom, Sandy and Bud listened as the radio announcer continued. Reports just in say that Brungaria has been taken over by a rebel group. Military aid to support the rebel coup is pouring in from Morivia, Brungaria's powerful province in the north. The Brungarian Prime Minister, his cabinet, and all loyal administrative personnel have fled or been arrested. Worried United States State Department officials admit that the surprise coup poses a new and dangerous threat to free world security. Part of their news reports will be broadcast as soon as they reach this station. The announcer ended. For a moment Tom and Bud were too stunned to speak. Sandy was wide-eyed with the realization that the news spelled trouble for Swift Enterprises and all America. Looks as though that CIA man who breathed us wasn't kidding, may skipper? Bud muttered at last. It came sooner than we expected, Tom said. Jumping up from the table, Tom switched off the radio and hurried to the hall telephone. In a few moments he managed to get a long-distance call-through to West Norris of the FBI. Is the news on this Brungarian coup as bad as it sounds, Wes? Tom inquired. Worse. That rebel bunch really has it in for us, as you know, Tom, Norris replied. They envy America and they'll move heaven and earth to steal our scientific secrets. This could touch off a whole epidemic of sabotage and other spy activity. Tom's jaw clenched grimly. He then asked the FBI man his opinion about the discovery of the secret arms cache in Pete Lattie's basement. Norris admitted he was puzzled. It doesn't add up, Tom, the FBI agent said thoughtfully. If our enemies were planning to destroy Shopton by a quake, why would anybody be needing a gun? I can't figure it myself, Wes, unless they were planning to raid and loot enterprises after the place was thrown into disorder, Tom deduced. What about Narco himself? Has he talked yet? Norris replied that although he had not interviewed Narco himself, FBI agents who had grilled the spy had failed to elicit any information. Here's something else, though, which might interest you, Norris went on. We now have reports that at the time of the Harkness and Medfield disasters, seismographs recorded simultaneous quakes off the coast of Alaska near the Aleutian chain. Tremors were also felt off the southwest coast of South America. A new factor to consider. Tom frowned in puzzlement as he hung up the telephone after completing his talk with the FBI man. After Tom had repeated the conversation to his companions, Bud said, You mean the H-bomb idea goes out the window? Tom shrugged. Wes says they found no evidence to support the theory of man-produced underground blasts. It just doesn't jibe with those other remote tremors. They'd be too much of a coincidence, happening at the same time. Then the quakes at Harkness and Medfield were real earthquakes, Sandy put in. Looks that way, Tom admitted. Those other tremors Wes mentioned follow a natural, circum-Pacific belt which is well known to seismologists. I'm no expert, but perhaps they could have set off chain reactions below the Earth's crust which triggered the two quakes in this part of the country. In that case, the young inventor reflected, it was only a freak of nature that the Faber and Nosecone factories had been wrecked by the shock. But in spite of the seismographic clues, Tom was not entirely convinced. A nagging doubt still buzzed in the back of his mind. The next morning Tom hurried off to his private glass wall laboratory at enterprises, eager to continue work on his container, or robot body, for the brain from space. Tom frowned as he studied the rough sketch he had drawn in his office the afternoon before. This set-ups full of bugs, he muttered. Nevertheless, Tom decided the basic idea was sound. Grabbing pencil and slide-rule he began to dash off page after page of diagrams and equations. Chow down! Boomed a fog-horn voice. Chow Winkler, wearing a white chef's hat, wheeled a lunch cart into the lab. Oh, thanks! Tom scarcely looked up from his work as the cook set out an appetizing meal of Texas hash, milk, and deep-dish apple pie on the bench beside the young inventor's papers. Grumbling under his breath, Chow sauntered out. Tom went on working intently between mouthfuls. In another hour he had finished a set of pilot drawings. Then he called Hank Sterling and Arvid Hansen and asked them to come to the laboratory. They listened with keen interest as Tom explained his latest creation. No telling if it will work when the energy arrives from space, Tom said, but I think everything tracks OK. Hank, get these plans blueprinted and assign an electronics group to the project. You'd better handle the hardware yourself. Right! Hank rolled up the sketches. And Arv, Tom went on, I'd like a scale model made to guide them on assembly. How soon can you have it? Hansen promised the model for some time the next day and the two men hurried off. As usual, Arv proved slightly better than his word. The expert model maker was devoted to his craft and is apt to forget the clock as Tom himself when absorbed in a new project. By working on in his shop long after closing hours, Hansen had a desk-size model of the space-brain robot ready for Tom's inspection when the young inventor arrived at the plant early the following morning. Wonderful, Arv! Tom approved. Every time I see one of your models of a new invention, I'm sure it'll work. Hansen grinned, pleased at the compliment. Tom hopped into a jeep and sped across the plant-grounds to deliver the model to Hank Sterling and his project crew. Work was already well along on the electronic sub-assemblies and the strange-looking body was taking shape. That afternoon Ames and Dilling returned from Washington. The report they gave to Tom bore out his hunch that the rebel Brungarian scientists might well be able to divert the space energy. The next day was Friday. Tom was hoping, although none too optimistically, that the container might be completed before the weekend. To his delight an Enterprise's pickup truck pulled up outside the laboratory later that afternoon and Hank rolled the queer-looking device inside. Hi, Buster! Tom greeted it. Is this your daddy? Hank chuckled. Don't look at me. It claims you're its daddy. But hanged if I can see much resemblance. Think it'll live? If not, Hank replied, only half jokingly, the boys who worked on it will sure be disappointed. No kidding, Skipper, that's quite a gadget you dreamed up. The device stood about shoulder-high with a star-shaped head, one point of which could be opened. The head would contain the actual brain energy. Its upper body, cylindrical in shape and of gleaming chrome, housed the output units through which the brain would react, and also the controls. Antennas projecting out on either side gave the look of arms. Its waist was girdled with a ring of repelletron radiators or exerting a repulsion force when it wanted to move by repelling itself away from nearby objects. Below the repelletrons was an hourglass shaped power unit housing a solar-charged battery. The power unit, in turn, was mounted on a pancake-shaped transportation unit. This unit was equipped with both casters and a sort of caterpillar crawler arrangement for the contrivance to get about over obstacles. Inside was a gyro-stabilizer to keep the whole device upright. Tom felt a glow of pride and eager impatience as he inspected the device. If it worked as he hoped, this odd creature might one day provide earth scientists with a priceless store of information about intelligent life on Planet X. Bud and Chow, entering the laboratory soon after Hank Sterling had left, found Tom still engrossed in his thoughts. Wow! Is that your spaceman? Bud inquired. Tom nodded, then grinned at his caller's gaping expressions. Each was trying to imagine how the thing would look in action. Sure is queer-looking buckaroo, Chow commented when Tom finished explaining how it was supposed to work. On a sudden impulse the poke took off his ten-gallon hat and plumped it on the creature. Then he removed his polka-dotted red bandana and nodded it like a necker-chiff just below the star-head. Tom laughed heartily as Bud howled, Radom Spaceman! Tom was eager to notify his mysterious space-friends that the container was now ready to receive the brain energy. Bud went with him in a jeep to the Space Communications Laboratory. Chow, however, stayed behind and stared in fascination at the odd-looking robot creature. The stout cook walked back and forth, eyeing the thing suspiciously from every angle. Wonder what the critter eats! he muttered. Feeling in his shirt pocket, Chow brought out a wad of his favorite bubble-gum. Should he or couldn't he? Shucks, wouldn't hurt to try! the old Texan decided. Chow unlocked the hinged point of the star-head and popped the gum inside. He was somewhat disappointed when nothing happened.  Meanwhile in the Space Communications Laboratory Tom was pounding out a message on the keyboard of the electronic brain. Tom had invented this device for automatically coding and decoding messages between the swifts and their space-friends. It was connected to a powerful transmitting and receiving apparatus, served by a huge radio-telescope antenna mounted atop the Communications Building. Bud looked on as Tom signaled. Tom swift to space-friends. Container for energy is now ready. Should it be placed outdoors? Stirred by a worrisome afterthought Tom added, Messages may be intercepted by enemy who wishes to steal energy. Suggest you use flight path to land exactly two miles west of first contact with us. By first contact you mean when that black missile landed at enterprises? Bud asked. Tom nodded. At that time he reminded Bud the Brungarians and their conquerors had not yet learned of the swift's communication from another planet. Hence they would have no idea of the site referred to, which would hamper any plans to kidnap the brain energy. I get it, Bud said. Smart idea, pal. Tensely the two boys waited for a reply from outer space. End of Chapter 6 Next episode, Chapter 7 Wall of Water Tom Swift and the Visitor from Planet X by Victor Appleton II This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, visit LibriVox.org Chapter 7 Wall of Water Minutes went by before the signal bell rang on the electronic brain. Both Tom and Bud dashed over to the machine as it began to spell out the incoming message on tape. Energy will come to the spot you suggested. We can control flight course, but while the energy is on Earth you will be in charge. We will have no control for twenty-one days. Then we will recall energy to bring us impressions and data of your world. The two boys stared at each other excitedly as the transmission ended. Wow! Bud murmured. If Planet X is a peaceful place, old Thinkbox is sureing for a jolt here on Earth. Tom grinned fleetingly at the reference to Chow's nickname for the robot creature. Then he became serious, knowing that Bud's words were all too true. The space visitor might also take back impressions of the suffering and war-like threats that some Earth countries inflict on one another. Maybe one day, Tom reflected, it would be different. In the meantime the young inventor realized he had an awesome responsibility. He must not only make the best use of the brain energy during its stay on Earth, but also keep it from falling into the hands of treacherous, brungarian plotters. Tom's thoughts were suddenly interrupted by the sound of girls' voices. Sandy and Phil were standing in the doorway of the Space Communications Laboratory. Talk about your deep thinkers, Sandy said teasingly. Goodness! We had no idea we'd be interrupting a session of the brain trust. Phil added, with a mischievous sparkle in her brown eyes. Maybe we should go away again, Sandy. Hey, hold it, you two! Bud exclaimed. What do you think, Tom? Are these the visitors we've been expecting from outer space? Well, I like that, Sandy pouted. Do we look like a couple of little green people? Tom chuckled and seized the opportunity to do a little teasing of his own. I think it's just your pointed heads that fooled us, sis. Then, as the two girls broke down in laughter, he added, Why the unexpected visit? Sandy and Phil explained that they had come to invite the boys to a picnic cruise on Lake Carlopa the next day. And while we're here, since it's practically quitting time anyhow, Sandy went on, her blue eyes twinkling. We might even let you drive us someplace for dinner. Guess they've trapped us, Bud, Tom said with a grin. OK, it's a deal, but first we have something to show you. He took the girls to his laboratory to show them the robot creature. It's marvellous, Sandy exclaimed, and Phil agreed. Early the next morning, Bud called for Tom and Sandy in his tomato red convertible. Then they stopped at the Newton's house to pick up Phil. Each girl had packed a picnic basket for the day's sale. Hmm, looks as though we're going to be well fed, Bud commented jokingly. What's on the menu, girls? Chicken and ham sandwiches, Sandy began. Pickles, olives, hard-boiled eggs, potato salad, Phil went on. Chocolate cake, milk, Sandy took up the list. Stop! You have as hungry as bears already, Tom warned. Right, Bud agreed. Come on, let's get this cruise underway. The two couples drove to the Shopton Yacht Club dock on Lake Carlopa. There they boarded the Sunspot, a beautiful 30-foot sailing-catch with the auxiliary engine which Mr. Swift and Mr. Newton had purchased for a frequently promised, but not yet realized, joint family vacation. The craft was equipped with twin gravitech stabilizers, mounted one on each side of the hull. These gave it amazing smoothness even when plowing through rough seas. They were adaptations of a device Tom had invented for his space kite and cosmic sailor. Oh, what a gorgeous day for a sail, Phil said, a glow with enthusiasm. The sky was a cloudless blue. Under a hot summer sun a brisk breeze was ruffling the lake into tiny whitecaps. The two couples cast off eagerly and were soon scutting out across the water full sail. Tom and Bud wore swimming trunks under their slacks. Unfortunately the girls had forgotten to bring their suits. When the Sunspot reached the center of the lake the boys hoved too, stripping down to their trunks and dived overboard. Meanwhile the girls' sun bathed on the deck. Soon it was time for the picnic lunch and all four ate with healthy young appetites. Jeepers, Sandy whispered to Phil with a giggle. After a feast like this we'll have to go on a diet. Don't say it, Phil warned, or Tom and Bud will use that as an excuse for never taking us out to—she broke off with a gasp. What's wrong, Tom asked? Breathless with fright, Phil pointed off to starboard. The others paled. An enormous wave was sweeping across the lake, straight toward the catch. Jumping jets, Bud gulped. It's like a tidal wave. The boat was already rocking under the swells that preceded the oncoming huge breaker. Quick, Tom yelled, grab life jackets while I start the engine. The four leaped into action. Every instant the terrifying wave rushed closer. By now it was a twelve-foot wall of water. Tom and the others had just put on the jackets and the engine had barely gunned into life when disaster struck. The mammoth wave swept up the sunspot and healed it far over into the trough like a toy bark. The next instant a cataract of water poured over the deck with stunning force. We're going under, Phil screamed. All four were swept overboard in the maelstrom. Under the smashing impact of the water the catch's main mast bent and groaned. A moment later came a crack like a gunshot. The mast broke off, hung teetering by shreds, then toppled into the water. As it fell the mast struck Sandy a grazing blow on the head. Sandy, Bud cried fearfully as he struggled in the swirling torrent. Calling on every ounce of strength he swam with powerful strokes toward the girl. Sandy was dazed and limp. Bud's husky arm circled her tightly. Then he began to fight his way toward shore. Tom and Phil, each struggling in the turbulent water, could only breathe a prayer of thanks as they watched the rescue. As the huge wave raced shoreward the lake water gradually became calmer in its wake. Tom was able to assist Phil and Sandy by now had recovered her faculties. The sunspot had capsized but could still be seen afloat some distance away. Rather than swim to it and cling to the hulk in the hope that a rescue boat would arrive the four decided to continue on toward shore. They knew that the aftermath of the tidal wave would keep all shore facilities in an uproar for hours to come. As they neared the beach the young people could see other overturned craft and heads bobbing in the water. A few daring persons finally began putting out in motorboats and rowboats to pick up the survivors. A hundred yards from shore one of the boats took Tom's group aboard. Minutes later they were scrambling out onto a dock. Are you all right, Sandy? Bud asked, his arm still around her. I—I think so, she gasped weakly, but I must have swallowed half the lake. Take it easy, sis," Tom added, as Sandy swayed and shuddered from the shock of her recent ordeal.  Phil, though won and white-faced, was in somewhat better shape. Tom, we must get these girls home as soon as possible, Bud declared. This, however, was not easily accomplished. The tidal wave had caused devastation along the entire shore front. Many docks had been wrecked, boats splintered like matchsticks, and buildings along the water smashed. When Tom's group reached Bud's convertible, parked near the yacht club pier, they found the car completely waterlogged. Its electrical system gave not even a faint sputter or spark. Oh, fine, Bud groaned. The crowning touch! Eventually ambulances and private cars began to arrive to transport the injured. Tom, Bud, and the two girls were given a lift to the Swift home where Sandy and Phil were immediately put to bed by a worried Mrs. Swift. On the stairs Tom switched on the TV set. A mobile camera crew from the local station was scanning the waterfront and interviewing witnesses of the disaster. To the two boys the most interesting note came in a statement by the announcer that a very slight earth tremor had been felt in Shopton. But no damage occurred except along the waterfront, the men explained. Tom gave a snort of anger, jumped up from his chair, and began pacing about the living room. Bud, I feel sure that that wall of water was caused by a minor earthquake, the young inventor declared. What's more, I'll bet it was man-made. Bud stared at his friend, appalled but feeling a hot surge of anger himself. If you're right, pal, it's the most fiendish sabotage I've ever heard of. Think of all the lives that were endangered. Tom nodded grimly. I am thinking. Both boys jerked around to look at the TV set again as a studio announcer's voice suddenly broke into the telecast. Flash, a severe quake has occurred at the headquarters of the American Archives Foundation, a hundred miles from Shopton. The Foundation's buildings, containing many priceless government and scientific documents, were badly damaged, and an underground microfilm vault was utterly destroyed. Apparently this quake was part of the tremor felt here at Shopton. Within minutes the Swift's home phone began jangling constantly. Some calls were from friends, others from strangers. Many of the calls were routed through from the Enterprise's switchboard. One was from Dan Perkins of the Shopton Bulletin. What about it, Tom? the editor demanded. I guess you know by now the public's aroused and in a state of near panic over all these quakes. What they all want to know is this. Are you, Tom Swift, going to find a way to stop all this destruction? Tom's jaw jutted out angrily. Yes, I am, he snapped, and you can quote me on that. End of Chapter 7, next episode, Chapter 8 A Suspect Talks Tom Swift and the Visitor from Planet X by Victor Appleton II This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, visit LibriVox.org Chapter 8 A Suspect Talks The next morning, Tom was up at the crack of dawn, grimly determined to find an answer to the earthquake menace. He ate a hasty breakfast, then drove to his private laboratory at Enterprises. He instructed the switchboard operator to shut off all incoming calls, then plunged into a study of the mystifying problem. Earthquake activity, Tom knew, tends to occur in circular patterns, like bands around the earth. For instance, the Circum-Pacific Belt, and another belt extending eastward from the Mediterranean through Asia and on to the East Indies. Often these quake lines are visible as breaks or ruptures along the ground surface, called fault traces. No doubt, Tom thought, there were many more uncharted ones. Could an enemy scientist be making use of these earth faults to produce a man-made quake? Tom mulled over the disturbing idea. How would I tackle the job myself, if I had to undertake such a project for national defense? The young inventor mused. He felt a growing sense of excitement as an idea began to take shape in his mind. What about an artificial shockwave? An hour later, Bud Barkley walked into the laboratory and found Tom hunched over a jumbled pile of reference books on his workbench. What cook, Skipper? Bud asked. Tom looked up, his blue eyes blazing. Bud, I think I may have the answer. Tom got up from his stool and paced about the laboratory. Suppose the Brungarian rebel scientists have invented some sort of shockwave producer, a device for sending vibrations through the earth's crust or the mantle underneath. OK, suppose they have, Bud replied. Tom snatched up a piece of chalk and made some quick diagrams on a blackboard. Just this, pal. Let's say they set up two or three stations around the world for sending out such waves in a definite direction. Wherever the wave crosses an earthfault or another wave, boom, an earthquake. Bud stared. No kidding. Is that how these rats triggered off all these quakes? It must be, Tom declared. It's the only possible explanation. Good night, Bud gasped weakly. What a weapon. Just push a button every so often and you go blow up another country bit by bit and no one could ever prove who was behind the attack. Tom nodded. Enough to make every American shiver if he only knew. What can we do about it? Bud asked. Tom resumed his worried pacing. I'll have to invent a shockwave deflector, Bud. It must be done in a hurry, too. Our enemy may start to destroy American cities as well as vital defense plants. Immediately Tom put through an urgent call to an eminent scientist in Washington who was a member of the National Research Council. Quickly he outlined a plan. Tom, I'll talk to the President's Special Science Advisor at once, the man promised. I'll try to set up a meeting for a ten o'clock tomorrow morning at enterprises. Feeling relieved, Tom left the plant with Bud. The two boys drove off to attend church with Mrs. Swift and Sandy. Then, after the Sunday midday meal, Tom returned to his laboratory to work on ideas for a shockwave deflector. Bud and Sandy, meanwhile, drove to the Shopton Yacht Club to inspect the damage to the sunspot. Tom had arranged with a salvage crew to tow the disabled catch back to its slip. Monday morning a sleek Air Force jet transport touched down at Swift Enterprises. A board were a select group of top government scientists. Tom and Bud greeted them as they disembarked on the runway, then drove them to a conference room in the enterprise's main building. I'd say your theory is right, Tom, about the quakes being produced by artificial shockwaves, said Burns Algren, a tall, hawk-faced man with a shock of red hair. He was a member of the Defense Department's Advanced Research Projects Agency. But how do we stop them? I believe they can be damped out by opposing waves, Tom replied. This is assuming that I can design the right sort of equipment to do the job, and also that we can set up a warning system to alert us of the enemy shockwaves in time. The young inventor sketched out the sort of shockwave deflector which he had in mind. The government experts were very much impressed. In the session that followed, the visiting scientists contributed many tips and suggestions. Tom noted them down gratefully. After a thorough discussion, it was agreed that the Defense Department would set up detectors at 50 checkpoints around the country. Tom would choose the exact spots. Detection data from the checkpoints would be fed to an electronic computer. The computer would establish the pattern, if any, of incoming enemy shockwaves. Dr. Gregg Miles, a seismologist from the Bureau of Mines, agreed to take on the job of setting up the checkpoints. Thanks for your prompt cooperation, Tom said, smiling gratefully as the meeting broke up. We should thank you, Tom, for coming up with a plan to cope with this fiendish threat, Algren replied. The others heartily agreed. Shortly after lunch, Tom was hard at work in his laboratory when the telephone rang. It was Chief Slater at Shopton Police headquarters. You'd better get over here fast, Tom, Slater said. Samson Narco is ready to talk. Tom needed no urging. Right, Chief! As he drove into Shopton, Tom wondered what the Brungarian agent would reveal. Was it possible that he might tip off the whole secret behind the destructive man-made earthquakes? Chief Slater was waiting in his office. Narco showed signs of cracking this morning, Slater told Tom. So I notified the Central Intelligence Agency. They're flying a man up here. In fact, he should be here by now. Narco won't talk till he arrives. How come? Tom asked. Narco wants a bargain, Slater explained. If the government will promise to deport him at once without trial, he'll spill what he knows. Tom whistled. I sure wouldn't want to be in his shoes when he gets back to Brungaria.  They'll know he must have made a deal to get off scot-free. Just then a taxi from the airport pulled up outside police headquarters and the CIA official was ushered into Slater's office. He proved to be John Thurston. Narco's waiting in his cell, Slater said after an exchange of handshakes. Let's hope he hasn't changed his mind. The Brungarian spy rose from his cot as the turnkey unlocked his cell-door. You are from Washington, eh? Narco said to Thurston. Very well. I presume the police have told you my offer. Is it a bargain? Thurston was poker-faced. You know the penalty for spying, he snapped. In your own country it would mean death. Why should we let you off? Narco's calmness evaporated. Beads of sweat burst out on his forehead. I have done no harm and I know little or nothing of my superior's plans, the spy said excitedly. Why should I lie to you with my life at stake? After all, I am only an insignificant but one important thing I do know and this I will reveal if you promise to deport me at once. Thurston eyed him coldly. Very well, the CIA man decided. You have my word. Narco sat down on his cot, breathing heavily. Then he looked up at the three Americans.  The Brungarian asserted. His words struck like a bombshell. Chief Slater and John Thurston stared at Narco in open-mouthed astonishment. Then Slater scowled.  I suppose they're going to fly a plane over and drop an atom bomb, just like that, he snapped his fingers. Thurston was also inclined to doubt Narco's story. Any such bold move by the Brungarians, he declared, would amount to an act of war. It is the truth, Narco shouted. Do not forget, you have made a promise." Tom Swift did not share Chief Slater's and Thurston's skepticism. Narco's words had chilled him with dismay. He called the other to a side and gave them a quick, whispered briefing on the theory he had discussed with the government scientists, asking them to keep it confidential. If the Brungarians indeed had a means of producing artificial shock waves, Tom pointed out, they could easily destroy Washington without the slightest risk to themselves. Both Thurston and Chief Slater were alarmed. Turning back to Narco, they grilled him for clues. But it seemed obvious that the Brungarian was telling all he knew, or, at any rate, all he intended to reveal. We're wasting our time, Thurston said, finally, with a look of disgust. But I made a promise in the name of the United States government, and the promise will be kept. Turning to Chief Slater, the CIA man added, Turn him over to the FBI and have them take him to New York. I'll arrange for a seat on the first plane for Brungaria. Tom drove back thoughtfully to Enterprises. Bud was waiting in his laboratory with news. Your dad went from Washington to Fearing Island and has gone up to your space outpost, Bud reported. He has to do some experiments for the government project he's working on. The outpost was a space station which Tom Swift Jr. had built 22,300 miles above the earth. It was a production factory for his famous solar batteries, and also an immensely valuable setup for space research and exploration. I think I'll radio dad and let him know what's going on, Tom decided. He may have some good suggestions, he usually does. Tom warmed up his private transmitter receiver and beamed out a code call through the automatic scrambler. Seconds later, the loudspeaker crackled in response. But just as the outpost operator's voice came through, the radio set exploded in Tom's face. End of Chapter 8. Next episode, Chapter 9 The Cave Monster. Tom Swift and the visitor from Planet X by Victor Appleton II. This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, visit LibriVox.org. Chapter 9 The Cave Monster. Skipper! Bud cried anxiously as Tom staggered back, his hands to his face. I'm all right, no harm done, Tom assured his friend. Both boys were a bit shaken by the accident nevertheless. Chow came rushing in as Bud was brushing the fragments of debris from Tom's clothes and examining the young inventor's face. Bahrain, my flying flapjacks! What happened?" Chow asked. The chef had been bringing a tray of fruit juice to the laboratory and heard the explosion outside. The radio set just blew up in my face, Tom explained. Fortunately, the equipment was transistorized mostly with printed circuits. Otherwise, he added, I might have been badly cut by slivers of glass from the exploding vacuum tubes. As it was, the young inventor had suffered only a few slight scratches and a bruise on the temple from a piece of the shattered housing. Bud swabbed Tom's injuries with antiseptic from the first aid cabinet while Chow poured out glasses of grape juice. What caused it, Tom? Bud asked as they paused to sip the fruit juice. Good question, Tom replied. Frankly, I don't know. But he was wondering if the set might have been sabotaged. Tom was still eager to get in touch with his father and telephone the electronics department to bring another set to his laboratory. Chow left just as the new set arrived. Tom hooked it up quickly, donned a set of goggles, and tuned to the space station frequency. Then he picked up the microphone and stepped well back from the set, waving Bud out of range at the same time. Tom swift, calling out post, come in, please. A moment later came another explosion. The new set had also blown up. Good night! Bud gasped in a stunned voice. Don't tell me that's just a coincidence. Tom shrugged. We can certainly rule out the possibility that anything was wrong with the radio itself. Every set is checked before it leaves the electronics department. So where does that leave us? Bud persisted.  Both times it seemed to happen just as the reply was coming through from the space station. There is no possibility that their signal was too strong. In other words, that the explosion was caused by overloading the receiving circuits. Are you implying that an enemy intercepted the message and sent some sort of ray that caused the set to explode? Bud demanded. Tom's face showed clearly that Bud had pinpointed the suspicion in the young inventor's mind. Could be. Bud was worried by this latest development. Skipper, suppose I hop up to the space wheel and talk it over with your dad. He may be able to help us detect any enemy moves. Good idea, pal, Tom agreed. The sooner, the better, I'd say. The boys exchanged a quick handshake and affectionate shoulder slaps. Then Bud hurried out to one of the Enterprise's hangers to ready a heliget for the flight to Fearing Island. This was the Swift's rocket base, just off the Atlantic coast. From there Bud would board one of the regular cargo shuttle rockets operating between the space station and Fearing. Tom, meanwhile, plunged back to work on his shockwave deflector. At ten the next morning he called in Hank Sterling and showed him a set of completed drawings. Hank, you did a fast job on the container for the brain, Tom began apologetically, but you'll really have to burn out a bearing on this one. Hank grinned. I'm geared to action. Say, what do we call it anyhow? He asked. Tom grinned. Chow told me last night this gadget looked like a fireplug under a rose trellis, and I ought to call it Fireplug Rose, but I've given it a more dignified name, the Quake-Elyser, which stands for an underground quake-wave deflector. Briefly Tom explained the various parts of his latest invention, which consisted of a hydrant-sized cylinder to be inserted into the ground with magnetic coils near the top. A smaller hydraulic cylinder, mounted above this, was wired to a metal framework and radio transmitter. This setup will detect any incoming enemy shockwaves, Tom said. We'll need fifty of them, so turn the job over to Swift Construction and have Uncle Ned put on extra shifts. The Swift Construction Company, managed by Ned Newton, was the commercial division which mass-produced Tom Jr.'s and Tom Sr.'s inventions. Information from the detector transmitters Tom went on would be fed into an electronic computer at the Bureau of Mines in Washington.  From each of its four sides jutted a hydraulic piston. How does it work, Tom? Hank asked. Dual control spheres on top, Tom explained, will receive by radio signal the pulse frequency computed in Washington. He added that inside each sphere was a pulse maker. This would produce changes in the pressure of the hydraulic fluid by affecting the kinetic energy of the fluid's atoms. The pressure changes would then be enormously magnified in the four hydraulic output drivers. When the unit was embedded in rock underground, the huge pistons would send out counter-shock waves through the Earth's crust to neutralize the enemy waves. Wow! Hank Sterling was breathless at the sheer scope of the young scientist's newest invention. I'll get hot on the job right away. After forty-eight hours of round-the-clock work, the equipment was ready. Tom conferred by telephone with both Dr. Miles in the Bureau of Mines and Bernt Ulgren in the Pentagon. He had already chosen the spots for the detector transmitter checkpoints. Tom told the men that he believed the best spot for the Quakerlizer itself was on a certain government reservation in Colorado. A deep underground cave there would provide a perfect site. We'll be close enough to the San Andreas Hall to prevent a really huge-scale disaster, Tom explained, and the rocky mountain structure will give us a good bedrock medium for shooting out waves anywhere across the continent. Dr. Miles and Ulgren agreed enthusiastically. Tom and the two scientists spoke over a three-way telephone hookup, with automatic scramblers to counter the danger of enemy monitors, laying plans to install the equipment. Ulgren agreed to fly a technical crew out to the spot in Colorado which Tom had named. The next day, Tom, Hank, and several top enterprises engineers, including Art Wiltessa, took off in the Sky Queen. This was Tom's huge atomic-powered flying lab. The massive plane flew at supersonic speeds and was equipped with jet-lifters for vertical take-off or hovering. A whirling duck heliplane, loaded with communications equipment, accompanied the Sky Queen. In little more than an hour, the two craft touched down in a rugged Colorado canyon. The government technical crew was already on hand. Glad to know you, Tom said, shaking hands with the engineer in charge. He introduced his own men and added, Better, roll up your sleeves, this job is going to take plenty of oomph. The parts of the Quakerlizer were unloaded from the Sky Queen onto dollies. Then the group, armed with bullseye lanterns, flashlights, and walkie-talkies, hauled the parts by tractor into the cave. OK, now let's pick out the spot for embedding the unit, Tom said. The men had no sooner begun to look around the huge underground chamber when a fearsome growl rumbled through the cave. Everyone whirled about, and the next instant froze in horror. A huge bear reared up in the mouth of the cave. The monster snarled and blinked its yellow eyes in the glare of lights. We're trapped, Hank cried out. The enormous Bruin was now waving his huge head from side to side, as if daring the intruders to step up and fight. Several of the government men had brought rifles and shotguns, but in spite of their peril no one wanted to shoot the handsome old fellow. I'll send out an SOS, Tom said, if help arise before the bear attacks we won't use guns. He radioed a local forest ranger post. After a nerve-wracking wait, with the group expecting a charge from the beast at any minute, two rangers appeared and captured the bear with a net. One man of the government work crew knocked together a stout wooden cage. The beast, outraged, was loaded aboard the helipane to be released in an area remote from the cave. Now the grueling job of installing the Quake-Elyzer began. First the cave was cleared of debris, bats, and other small living creatures, then a site was marked out on the cave floor. Tom had brought along a midget model of his great atomic earth blaster, which he had invented to drill for iron at the South Pole. With the blaster, Tom quickly drilled a pit of exact size into the bedrock. Then the Quake Elyzer was assembled and lowered into place by a portable crane. A power plant and radio antenna were set up and the installation was finally completed. I must return to Shopton now, Tom said. Art here will stick around and help you operate the setup. He told the government engineers after radio contact had been made with Washington. If anything goes wrong, just flash word to Enterprises. The Sky Queen and the helipane sped back across the continent. As Tom landed at Enterprises, he was greeted by Bud, who came speeding out on the airfield by Jeep. Just got back from the space-wheel about an hour ago, Bud said. Your dad's really worried about those exploding radio sets, Tom. He has no clues, but he's sure the scientists working for the Brungarian Rebels setup are responsible. He thinks they may try to ruin all of Enterprises' communication system by remote control. Tom's face was grave as he listened. The two boys discussed the problem as they drove to the Swift's office in the main building. Boy, I sure wish I could think of some way to cope with it, Tom said wearily, flopping down in his desk chair. Your dad said to give it the old college try, Bud reported, and he also said he'd be back in two days to help you on the problem. Tom glanced at the calendar. Which reminds me, he said, on Monday the brain energy will be due from space. The thought sent a thrill of excitement tinged with worry through the young inventor's mind. Would the container he had devised prove suitable? Hey! A call on the videophone! Bud pointed to the red light flashing on the control board. He jumped up and switched on the set. Blake, the Washington announcer, appeared on the screen. Bad news, Skipper, he said ominously. An earthquake tremor was just felt here in Washington. It centered in a shipyard on the Potomac and caused great damage. End of Chapter 9. Next episode, Chapter 10. Energy from Planet X.


Hello friends, myself Professor Narendra Kartikar, Assistant Professor, Department of Mechanical Engineering, Valachandra Institute of Technology, Solapur. Today, I am going to present a topic on Blow Molding. The blow molding topic at the end of this session, students will be able to understood the process as well as the application of plastic blow molding process. The content for this presentation, the flow will be like this, introduction, plastic blow molding process, polymers commonly used for blow molding advantages of the blow molding process, disadvantages of the blow molding process and applications for the blow molding process. Now, in this presentation, we will see one of the particularly plastic part manufacturing process that is blow molding process. Now, in the introduction, let us see the important points, plastic material, need of plastic material products, plastic part manufacturing. As you know, the plastic material, the importance of the same is increasing day by day, due to its whatever the number of advantages properties over the other material. For many of the technical as well as the domestic products, now the material has been replaced through the means of plastic and subtype of plastics. This need of plastic material products is increasing to fulfill the current environmental conditions as well as through the means of optimized costings. The very important property for the plastic is the easily moldable and it can be recycled in many sense. In consideration with the less weight as well as many other properties like major important optical property, thorough transparent to thorough opaque kind of properties delivers the extended use of plastic in the particularly many of the plastic part manufacturing. Now, when we discuss the plastic part manufacturing, as per the design, shape, geometry, quantity and cost, the very number of plastic part manufacturing processes are defined. Out of that, considering the above features, we have to select one of the process. Now, in this presentation, let us see the one of the important plastic part manufacturing through the means of plastic blow molding process. Plastic blow molding process is normally is going to be used to produce the hollow parts. Now, in the three steps, we can see over here how the blow molding process goes. In the step one, you can observe that the red part plastic raw material is present in the form of stick. It is called as the Parisian stick. The mold halves are normally divided into two parts. The Parisian stick is inserted into the mold cavity. Now, the melted polymer material is injected between the two closed half of the mold in the step one. Normally, the natural air or a particular waste gas is going to be inserted to the Parisian stick through the means of high pressure nozzles. Now, in the step two, you can observe the particular Parisian stick raw material is tried to be expanded and it is going to be adhered the internal mold surfaces wall. Now, the expansion can be restricted through the means of molding walls. Obviously, the calculation of gas to be feed into the Parisian stick rather the mold is calculated. All the parameters of gas gas flows are calculated. The Parisian stick volume is equivalent as that of the particular part to be produced etc. Now, in the step two, as you can see the air enters the cavity and pushes the polymer into the shape of the mold. In the third stage, you can see that the Parisian stick is fully now expanded and got the shape of inner wall surface of the cavity. Further, it has been cooled down for a very few seconds. Further, immediately the molds halves are moved out from their original position and the completed solidified plastic part will be get fall down. Now, in these three stages, you can imagine that particular parts can be produced in a very easy way in a with the means of blow molding. Now, the further one more slide for imagination has been inserted. This is the plastic pit bottle used for oil storing purpose. You can see that blue Parisian stick is there in the first stage of diagram. Now that Parisian stick is inserted into the die cavity. In the second stage, you can see that the air is trying to be inserted into the Parisian stick. In the third, fourth stage, you can observe that the Parisian stick is trying to be bulge and in a bulging stage, the diagram shows that the material is trying to cover up uniformly the walls rather the inner walls of the mold. In the last and second last stage, you can observe that almost the inner wall geometry is accommodated by the plastic raw material itself. In the last diagram, you can observe that thoroughly the plastic bottle is ready. Normally, the polymers used for blow molding processes are polyamide, polyethylene and so many others. Advantages of blow molding as it is a very fast production, low cost in mass production. Material and color flexibility delivers the extended use of blow molding. The low labor cost and low waste will also improve the efficiency of the blow molding. It has some certain limitations, high initial tooling cost, high initial setup cost and these are the only use for hollow part designs. Now my dear friends, application of blow molding. At this stage of this session, are you able to share some of the day to day application of plastic blow molding process? Try to enlist the same? Yes. Now, but I will share you some of the application of blow molding. The water and medicine bottles, pet bottles, decorative hollow parts and storage containers. These are the some of the applications of blow molding. I suppose that you had learned the particularly all the details of blow molding in a technical sense. The applications which I shared with you, those are technical as well as domestic purpose. Thanks for this presentation NPTEL's website Wikipedia as well as modern plastic handbook. Thank you.