Timing a Motor Cycle
Mary Evans Picture Library Photo Prints and Wall Art
Timing a Motor Cycle
Timing a motor cycle : when the machine crosses beams from photo-electric cella at the start and finish of the run, the time is measured. (In fact, the beam is invisible.)
Media ID 597573
© Mary Evans Picture Library
Beam Beams Cella Crosses Cycle Cycling Electric Fact Finish Invisible Measured Start Timing
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