The monowheel was tech’s improvement on bicycles. It didn’t catch on.

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September 1932

J. A. Purves drives a Dynasphere spherical car, an automobile shaped like a giant radial tire. Mr. Purves was the vehicle's inventor.

Image: Hulton-Deutsch Collection/CORBIS

The bicycle had its origins in 1817 in the Velocipede, a powerless wheeled frame which the rider sat astride....

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