on a car, showing the speed of the vehicle in kilometres per hour. Also shown is the tachometer, which displays the rate of rotation of the engine's crankshaft.]] A speedometer (commonly misspelled spedometer) is a device that measures the instantaneous speed of a land vehicle. Now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards. Speedometers for other vehicles have specific names and use other means of sensing speed. For a boat, this is a pit log. For an aircraft, this is an Airspeed indicator. The speedometer was invented by the Croatian Josip Belu?i? of in 1888, his invention was originally called a velocimeter. Operation Eddy current The eddy-current speedometer has been used for over a century and is still in widespread use. Until the 1980s and the appearance

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