The Tesla Air-Friction Speedometer in the 1920 Pierce-Arrow.
In terms of automotive history, we often think of Tesla in the present but not in the past. Yet in 1920, the Pierce-Arrow, a very high-end automobile manufacturer, featured a patented, Waltham-built "air-friction" speedometer, invented by engineering genius Nikola Tesla. The speedometer had a jeweled mechanism that operated by the friction of the air generated within within the instrument by the speed of the car. Unlike the ordinary cable-operated speedometer, it was free of any inaccuracies caused by dirt, grease, or wear of gears.
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