When Robert Thomson invented the pneumatic tire a century and a half ago, a rubber doughnut inflated with air was only one of several ideas the Scotsman proposed for softening the ride and reducing the power required to propel the carriages of his day. Thomson also suggested filling what he called his “aerial wheel” with sponges, springs, and/or horsehair to avoid flats caused by “concussion between the wheel and the roadway.” (more…)
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