“At least lock those papers in that iron safe I noticed in your office,” urged Jack.
“I shall do so. Thank you for what you have done. Good-night!”
“Good-night!” hailed the boys, “we’ll see you to-morrow.”
“I hope so, and I hope you will bring with you some solution of my difficulties.”
CHAPTER VII.
THE LAUNCHING OF THE MODEL.
That night in the library of the Chadwick home, two boys and a dignified looking man, who wore a nut-brown beard slightly tinged with gray, sat poring over a pile of books and papers, their work illumined by a strong electric reading lamp.
The eldest of the party was, of course, Mr. Chester Chadwick, and the two lads, his son and nephew. Tom’s father, Mr. Jesson, was absent in the Northwest, making a collection of the flora of the region.
“It is plain enough,” Mr. Chadwick was saying, “that your friend’s craft, owing to its construction, cannot be equipped with the usual tanks employed in submarine designing. What we have to do, is to find out some other way of forcing it beneath the surface and keeping it there, if necessary.”
Jack, who had been busy with a sheet of paper for the last twenty minutes, looked up.