ten o'clock
What is the use of Davy-lamps ? what is the use of all our care as to the ventilation , if at any moment the gas may be fired at a lamp opened for lighting a pipe ? I like my pipe , but if I thought there was ever any chance of its becoming my master I would never touch tobacco again . '' Three days later , when Jack came up from his rounds at ten o'clock , to eat his breakfast and write up his journal of the state of the mine , he saw Mr. Brook and the manager draw up to the pit mouth . Jack shrank back from the little window of the office where he was writing , and did not look out again until he knew that they had descended the mine , as he did not wish to have any appearance of thrusting himself forward . For another hour he wrote ; and then the window of the office flew in pieces , the chairs danced , and the walls rocked , while a dull heavy roar , like distant thunder , burst upon his ears . He leaped to his feet and rushed to the door .