Question

define the speedometer?​

Answer 1

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A speedometer or a 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 1900s, and as standard equipment from about 1910 onwards.[1] 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.

Charles Babbage is credited with creating an early type of a speedometer, which was usually fitted to locomotives.[2][3]

The electric speedometer was invented by the Croatian Josip Belušić[4] in 1888 and was originally called a velocimeter