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.