Hydrocycle
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A hydrocycle is a bicycle-like watercraft. The concept was known in the 1870s as a water velocipede and the name was in use by the late 1890s.
Water velocipede, c. 1877
Man operating water tricycle, probably early 20th Century
A Hydrobike brand hydrocycle
Modern pedal catamaran with propeller drive (Germany, 1999).
Crankset
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The crankset or chainset is the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain or belt, which in turn drive
A Shimano 105 crankset with two chainrings on a road bicycle
A Shimano Deore right crankset, showing crank arm, spider, three chainrings and chainring guard
Belt-drive crankset on a Trek District
A left crank attached with a cotter