Journal of the Society of Motion Picture Engineers ( Volume: 27, Issue: 5, November 1936)

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Use of Motion Pictures in an Accurate System for Timing and Judging Horse-Races

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: An accurate system for timing and judging horse-races installed at Santa Anita Park, Calif., consists of photoelectric cells placed around the track at appropriate positions; a visual electric timing board placed in the infield; two electrically driven cameras associated with electrically driven clocks mounted in a booth above the grandstand exactly at the finish line; and rapid film processing and printing equipment connected to the cameras in a darkroom immediately behind them. The horses at the starting position interrupt the light-beam focused upon the photoelectric cell, transmitting an impulse to a central control cabinet mounted in the camera booth, and thence to the electric clocks associated with the cameras and to the rotary selector switches operating the electric timer in the infield. The time of each quarter-mile interval of the race is recorded visually on the electric timer. Two special 16-mm. cameras are mounted exactly at the finish line, and are equipped with a double-lens train: one to photograph the horses crossing the line; the other to record, on the same frame, the reading of the clock associated with the camera. The cameras are driven by synchronous motors at speeds of 62 to 101 double frames per second. The electric clocks are crystal-controlled at 200 cps. The clocks are started by the impulse from the first photoelectric cell in the race, and stopped manually after the cameras are stopped. The cameras are operated manually to photograph the order and the time of the finish.
Publication Date: 1936-11-01
DOI: 10.5594/J08611
Link: https://doi.org/10.5594/J08611
Author(s): H. I. Day

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H. I. Day; Use of Motion Pictures in an Accurate System for Timing and Judging Horse-Races, Journal of the Society of Motion Picture Engineers ( Volume: 27, Issue: 5, November 1936); SMPTE, 1936. Available at https://doi.org/10.5594/J08611

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H. I. Day; Use of Motion Pictures in an Accurate System for Timing and Judging Horse-Races, Journal of the Society of Motion Picture Engineers ( Volume: 27, Issue: 5, November 1936); SMPTE, 1936. Available at https://doi.org/10.5594/J08611

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<span class="citation">H. I. Day; <cite>Use of Motion Pictures in an Accurate System for Timing and Judging Horse-Races</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 27, Issue: 5, November 1936); SMPTE, 1936. Available at <a href="https://doi.org/10.5594/J08611" target="_blank" rel="noopener">https://doi.org/10.5594/J08611</a></span>

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<li>
H. I. Day; <cite id="bib-10-5594-j08611">Use of Motion Pictures in an Accurate System for Timing and Judging Horse-Races</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 27, Issue: 5, November 1936); SMPTE, 1936
<span class="doi">10.5594/J08611</span>
</li>