eight o'clock
`` It 's almost dark now , and we could do it better and easier in the daylight . What do you say if you all come around after supper and we 'll dope out a wiring diagram and maybe make a start on building the tuning coil . '' Joe reluctantly consented to this , and the four companions separated for the time being , after promising to return to Bob 's house that evening . And true to their promise , the boys had all returned to the Layton home by eight o'clock that evening , full of enthusiasm for the task that lay before them . Mr. Layton was mildly interested in the radiophone project , but after a few questions he retired to the library with the evening paper , leaving the boys to their own devices . `` Well , fellows , '' said Bob , `` here we are , all set for a busy evening . What shall we do first ? ''