Monowheel from the 1930s was called The Dynasphere.
Believe it or not, this crazy looking vehicle was built based on a drawing made by Leonardo da Vinci! Known as a monowheel, the design for this wheel was patented in 1930 by a British inventor named Dr. J. A. Purves who modeled his design after Da Vinci’s. Purves was confident that his monowheel would be the next big automotive craze…he even said so in an article in “Popular Mechanics” magazine. The monowheel drove just fine, but it had one big flaw when braking or accelerating. The force would cause the driver carriage, with the driver inside, to whip around the wheel, much like when a hamster suddenly stops while running on a wheel. Oops.
end quote from:
http://historydaily.org/30-rare-historical-photos-and-the-story-behind-them/25
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