Note 32 — Chapter I

“He was a foolish man,” says Dr. Arnott, “who thought he had found the means of commanding always a fair wind for his pleasure boat by erecting an immense bellows in the stern. The bellows and the sails acted against each other, and there was no motion: indeed, in a perfect calm, there would be a little backward motion, because the sail would not catch all the wind from the bellows.”—Arnott, “Elements of Physics,” p. 120.