The Dinasfera or Dynasphere vehicle, patented in 1930 by the British engineer John Archibald Purves, inspired by a sketch by Leonardo da Vinci. 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. Steering of the prototype was crude, requiring the driver to lean in the direction sought to travel, though Purves envisioned future models equipped with gears that would shift the inner housing without leaning, thus tipping the Dynasphere in the direction of travel. The reason it didn't succeed were to do with the steering and brakes. It seems as if they moved on from the idea rather quickly. You decide..
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