Next to the kitchen was the berthroom of the vessel, sixteen feet long. But the door was shut, and I could not see the management of it, which might have given me an idea of the number of men employed on board the _Nautilus_. At the bottom was a fourth partition that separated this office from the engine-room. A door opened, and I found myself in the compartment where Captain Nemo—certainly an engineer of a very high order—had arranged his locomotive machinery. This engine-room, clearly lighted, did not measure less than sixty-five feet in length. It was divided into two parts; the first contained the materials for producing electricity, and the second the machinery that connected it with the screw. I examined it with great interest, in order to understand the machinery of the _Nautilus_. “You see,” said the Captain, “I use Bunsen’s contrivances, not Ruhmkorff’s. Those would not have been powerful enough. Bunsen’s are fewer in number, but strong and large, which experience proves to be the best. The electricity produced passes forward, where it works, by electro-magnets of great size, on a system of levers and cog-wheels that transmit the movement to the axle of the screw. This one, the diameter of which is nineteen feet, and the thread twenty-three feet, performs about a hundred and twenty revolutions in a second.” “And you get then?” “A speed of fifty miles an hour.” “I have seen the _Nautilus_ manœuvre before the _Abraham Lincoln_, and I have my own ideas as to its speed. But this is not enough. We must see where we go. We must be able to direct it to the right, to the left, above, below. How do you get to the great depths, where you find an increasing resistance, which is rated by hundreds of atmospheres? How do you return to the surface of the ocean? And how do you maintain yourselves in the requisite medium? Am I asking too much?” “Not at all, Professor,” replied the Captain, with some hesitation; “since you may never leave this submarine boat. Come into the saloon, it is our usual study, and there you will learn all you want to know about the _Nautilus_.” CHAPTER XII SOME FIGURES A moment after we were seated on a divan in the saloon smoking. The Captain showed me a sketch that gave the plan, section, and elevation of the _Nautilus_. Then he began his description in these words:—