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    Who invented the speed gun?

    Question #64785. Asked by tjoebigham.

    Brainyblonde

    		American traffic engineer John Barker discovered in 1947 that moving automobiles would reflect radar waves, which could be analyzed to determine the car’s speed. Police began using traffic radar in the 1950s, and the accuracy of traffic radar has increased markedly since the 1980s.
    http://encarta.msn.com/encyclopedia_761569568_7/Radar.html

    Apr 19 06, 12:35 PM
    xfacilitatorx

    		Doppler in theory.

    Apr 21 06, 12:42 AM

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