Roy Rockwood, The Wizard of the Sea — Chapter 16 (1900)
“ Now will you tell me how you manage for air?""I will not trouble you with chemical details," answered the captain, "which you would not understand, but when I do not take in air at the surface, I have some compressed in the reservoir, which, by means of an apparatus, is wafted all over the ship.""And about light and moving about?""That is the result of electricity, which I make myself. My motive power is electricity, and I can attain a speed of thirty miles an hour. The men of the world have not yet discovered half the value of electricity. My machinery is of the finest kind. ”
