Photocells

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Photocells The finish beam is wired to the timer’s clock so that when the beam is broken by the passage of a competitor across the finish line, the circuit causes the time of day to be recorded and printed on a paper tape.
Photocells The finish beam is wired to the timer’s clock so that when the beam is broken by the passage of a competitor across the finish line, the circuit causes the time of day to be recorded and printed on a paper tape.

The finish beam is wired to the timer’s clock so that when the beam is broken by the passage of a competitor across the finish line, the circuit causes the time of day to be recorded and printed on a paper tape.

The start time is then subtracted from the finish time to yield the elapsed time that is recorded and printed on a paper tape along with either the competitor’s start number or bib number; this is the competitor’s official time.


Image:Tag Heuer photo cells.jpg

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