24/43 He invented pumping engines, steam engines, fire engines, and caloric engines. His first patent for a "reciprocating propeller" was taken out in October 1834. To exhibit its action, he had a small boat constructed of only about two feet long. It was propelled by means of a screw; and was shown at work in a circular bath in London. It performed its voyage round the basin at the rate of about three miles an hour. |