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).
Bicycle pedal
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The pedal is the part of a bicycle that the rider pushes with their foot to propel the vehicle. It provides the connection between the cyclist's foot or shoe and the crank allowing the leg to turn the
Hydrocycle
…The concept was known in the 1870s as a water velocipede and the name was in use by the late 1890s. Power is collected from the rider via a crank with pedals, as on a bicycle, and delivered to the water or the air via a propeller. Seating may be upright or recumbent, and multiple riders may be accommodated…
Simple platform bicycle pedal
Wellgo DMR V8 Copy pedal
Mountain bike platform pedals made of nylon composite, with replaceable traction pins and sealed bearings.
Bicycle pedal, quill road type, with toe clip and toe strap (1970s)