In fact, the vessel combined the systems of Cossus, La Landelle, and Ponton d'Amecourt, as perfected by Robur.

But it was in the choice and application of his motive force that he could claim to be an inventor.
Machinery .-- Robur had not availed himself of the vapor of water or other liquids, nor compressed air and other mechanical motion.

He employed electricity, that agent which one day will be the soul of the industrial world.

But he required no electro-motor to produce it.
All he trusted to was piles and accumulators.

What were the elements of these piles, and what were the acids he used, Robur only knew.