Speedometer
Speed gauge in motor vehicles / From Wikipedia, the free encyclopedia
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A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the early 20th century, and as standard equipment from about 1910 onwards.[1] Other vehicles may use devices analogous to the speedometer with different means of sensing speed, eg. boats use a pit log, while aircraft use an airspeed indicator.
Charles Babbage is credited with creating an early type of a speedometer, which was usually fitted to locomotives.[2]
The electric speedometer was invented by the Croat Josip Belušić[3] in 1888 and was originally called a velocimeter.