Could the Dynasphere have replaced the car? Probably not, but it’s still fun to dream of an alternate world in which it did. Via the Museum of RetroTechnology:
The Dynasphere was invented Dr. J. H. Purves. In the picture below, the son of the inventor is at the controls, and apparently having some difficulties in steering; leaning this monowheel to one side is clearly not going to be easy. The Dynosphere was reported to have reached 30 mph on this run…[and] was said to have weighed 1000 pounds. One eye-witness states: “As a lad one day in the 1930s I went to the beach and saw a man trying to drive a huge wheel across the sands. It wasn’t very successful and wobbled about … I have always wondered what it was or whether I imagined it.”
More on: Museum of RetroTechnology

