When the apparatus is at work this gas becomes luminous, giving out a white and continuous light.

Thus provided, I can breathe and I can see." "Captain Nemo, to all my objections you make such crushing answers that I dare no longer doubt.

But, if I am forced to admit the Rouquayrol and Ruhmkorff apparatus, I must be allowed some reservations with regard to the gun I am to carry." "But it is not a gun for powder," answered the Captain.
"Then it is an air-gun." "Doubtless! How would you have me manufacture gun powder on board, without either saltpetre, sulphur, or charcoal ?" "Besides," I added, "to fire under water in a medium eight hundred and fifty-five times denser than the air, we must conquer very considerable resistance." "That would be no difficulty.

There exist guns, according to Fulton, perfected in England by Philip Coles and Burley, in France by Furcy, and in Italy by Landi, which are furnished with a peculiar system of closing, which can fire under these conditions.

But I repeat, having no powder, I use air under great pressure, which the pumps of the Nautilus furnish abundantly." "But this air must be rapidly used ?" "Well, have I not my Rouquayrol reservoir, which can furnish it at need?
A tap is all that is required.