Other Claims To Invention
Some historians who have studied the invention of the pedal-driven bicycle, including David Herlihy, state that Macmillan was not the first inventor. Herlihy states there is no contemporary documentary evidence that a pedal-crank design was applied to a 2-wheeled vehicle and that letters from customers in Scotland to the Michaux company in 1868 state that all of the human-powered vehicles there are tricycles and quadracycles. A similar claim is made in a short introduction in David Gordon Wilson's Bicycling Science, 3rd edition.
Read more about this topic: Kirkpatrick Macmillan
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