It served as a reservoir for compressed air, which a valve, worked by a spring, allowed to escape into a metal tube.

A box of projectiles in a groove in the thickness of the butt end contained about twenty of these electric balls, which, by means of a spring, were forced into the barrel of the gun.

As soon as one shot was fired, another was ready.
"Captain Nemo," said I, "this arm is perfect, and easily handled: I only ask to be allowed to try it.

But how shall we gain the bottom of the sea ?" "At this moment, Professor, the Nautilus is stranded in five fathoms, and we have nothing to do but to start." "But how shall we get off ?" "You shall see." Captain Nemo thrust his head into the helmet, Conseil and I did the same, not without hearing an ironical "Good sport!" from the Canadian.
The upper part of our dress terminated in a copper collar upon which was screwed the metal helmet.

Three holes, protected by thick glass, allowed us to see in all directions, by simply turning our head in the interior of the head-dress.