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The Dynasphere (sometimes misspelled Dynosphere) is a monowheel vehicle design patented in 1930 by John Archibald Purves FRSE (7 August 1870 – 4 November 1952) from Taunton, Somerset, UK.Purves' idea for the vehicle was inspired by a sketch made by Leonardo da Vinci. Design Two prototypes were initially built: a smaller electrical model, and one with a gasoline motor that attained either 2.5 or 6 horse power depending on the source consulted, using a two-cylinder air-cooled Douglas engine with a three speed gear box, also providing reverse. The Dynasphere model reached top speeds of 25–30 miles per hour (40–48 km/h). The gasoline-powered prototype was 10-foot (3.0 m) high and built of iron latticework that weighed 1,000 pounds (450 kg). The next generation version had ten outer hoops, covered with a leather lining, shaped to present a small profile to the ground.The driver's seat and the motor were part of one unit, mounted with wheels upon the interior rails of the outer hoop. The singular driving seat and motor unit, when powered forward, would thus try to "climb" up the spherical rails, which would cause...