Amphibious cycle

Wenkels water tricycle 1895
Water bicycle by Baumgartner and Hirth about 1910
Water bicycle by Julius Bettinger about 1915
Amphibious bike 'Cyclomer', Paris, 1932
Patent drawing of 'Ciclo Amphibious', 1971

An amphibious cycle is a human-powered vehicle capable of operation on both land and water. Some designs allow riding directly into and out of the water, other semi-amphibious cycles must be converted in order to change from one mode to the other.