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Tesla speedometer

Air-Friction Speedometer

Invention added 4/18/2018
Tesla's air-friction speedometer manufactured by the Waltham Company

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U.S. Patent 1,274,816 - Speed Indicator

Patent added 3/1/2015
Among the desiderata of speedometer construction are these: that the torque exerted upon the secondary, or indication-giving, element shall be linearly proportional to the speed of the primary member rather than to the square of the speed (as instanced in centrifugal speedometers); that the torsional effect at low...

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U.S. Patent 1,209,359 - Speed-Indicator

Patent added 3/1/2015
In the provision of speed indicators, that give direct readings of rate of motion, - for example shaft speeds in terms of revolutions per minute or vehicle speeds in miles per hour - it is obviously important that the instrument be simple, inexpensive and durable, and that its indications be correct throughout a...
A Waltham Company advertisement featuring the Tesla speedometer

A Waltham Company advertisement featuring the Tesla speedometer

Image added 3/1/2015
A Waltham Company advertisement featuring the Tesla speedometer.

Tesla's air-friction speedometer manufactured by the Waltham Company

Tesla's air-friction speedometer manufactured by the Waltham Company

Image added 3/1/2015
Tesla's air-friction speedometer manufactured by the Waltham Company.