And so the time has come when, for the present, we must bid good-bye to the Boy Inventors. But we shall meet them again ere long, and learn something more about their mechanical skill and clever daring. The next volume of their adventures will deal with a particularly enthralling subject—that of submarine work. Of the dangers and difficulties our young heroes faced under the water you may read in The Boy Inventors’ Diving Torpedo Boat.
***END OF THE PROJECT GUTENBERG EBOOK THE BOY INVENTORS AND THE VANISHING GUN