Article
Article
Speedometer
Article By:
Grimm, Robert A. AC Spark Plug Division, General Motors Corporation, Flint, Michigan.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.643400
A device for indicating the speed of a vehicle. The mechanical analog speedometer (Fig. 1) was introduced around 1906, when automobiles were beginning to increase in numbers. While this type of speedometer continues in wide use, changing technology has resulted in increasing numbers of quartz electric analog speedometers and digital microprocessor speedometers.
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