The Dynasphere was a monowheel vehicle design patented in 1930 by Dr J. A. Purves, August 7, 1870 -November 4 1952, from Taunton, Somerset, UK. Purves' idea for the vehicle was inspired by a sketch made by Leonardo da Vinci.
Photo of a woman in a Dynasphere, 1931.
Funny. I was just thinking about "monocycles" a few days ago. Another idea that's been around for ages, but never seems to enter the arena of practicality.
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