Picture No | 10146838 |
Date | circa 1937 |
Description | Timing a Motor Cycle |
Details |
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.)
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Source | Illustration by Shuffrey in Wonder Book of Electricity page 48 |
Credit | Mary Evans Picture Library |
Restrictions |
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