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"Remarkable invention in spherical locomotion, which, it is claimed, will one day revolutionise modern transport." Modern Mechanics June 1932 article  The Dynasphere (sometimes misspelled Dynasphere) was a monowheel vehicle design patented in 1930 by Dr J. A. Purves FRSE (1870 – 1952) from Taunton, Somerset, UK.  Purves' idea for the vehicle was inspired by a sketch made by Leonardo da Vinci.

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