A speedometer 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 Belušić in 1888, and was originally called a velocimeter.
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