Several manufacturers in France and England made their own dandy-horses during its brief popularity in the summer of 1819—most notably Denis Johnson of London, who used an elegantly curved wooden frame that allowed the use of larger wheels. In the United States, a patent for a two-wheeled human-powered vehicle was awarded to W.K. Clarkson of New York on June 26, 1819. However, in 1836, a fire in the U.S. Patent Office destroyed the only surviving drawings, and a prototype of the invention was never built by Clarkson.
