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Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 7, July 1941)
[ACTIVE]

Characteristics of Intermittent Carbon ARCS

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
Although the carbon arc is usually considered as a continuous source of light, the experiments reported in this paper show that it may be used for the generation of light surges as well. If these surges are made to occur at a rate so fast that the arc stream does not have time to deionize between them, then the electrical circuit may be completely broken at the conclusion of each surge and closed again to initiate the next one. For longer periods between surges, a very low maintaining current is employed. The timing and duration of the light pulses are controlled by electronic switching of half-cycle current surges from an alternating-current supply. For a given size of carbon, much higher brilliancy and candle-power can be obtained in intermittent than in continuous operation; a brilliancy of 1600 candles per sq-mm is reported for a 7-mm carbon of the “Suprex” type. The efficiency of the intermittent carbon arc is limited by the thermal lag in the electrodes, in that they continue to radiate energy for a considerable period after the current is reduced to zero at the end of each surge.
Publication Date
1941-07-01
DOI
10.5594/J16553
Link
https://doi.org/10.5594/J16553
Author(s)
F. T. Bowditch, R. B. Dull, H. G. Macpherson
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F. T. Bowditch, R. B. Dull, and H. G. Macpherson; Characteristics of Intermittent Carbon ARCS, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 7, July 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J16553
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F. T. Bowditch, R. B. Dull, and H. G. Macpherson; Characteristics of Intermittent Carbon ARCS, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 7, July 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J16553

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F. T. Bowditch, R. B. Dull, and H. G. Macpherson; Characteristics of Intermittent Carbon ARCS, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 7, July 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J16553
Snippet:
<span class="citation">F. T. Bowditch, R. B. Dull, and H. G. Macpherson; <cite>Characteristics of Intermittent Carbon ARCS</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 7, July 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J16553" target="_blank" rel="noopener">https://doi.org/10.5594/J16553</a></span>

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Preview:
F. T. Bowditch, R. B. Dull, and H. G. Macpherson; Characteristics of Intermittent Carbon ARCS, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 7, July 1941); SMPTE, 1941
doi: 10.5594/J16553
url: https://doi.org/10.5594/J16553
Snippet:
<li>
F. T. Bowditch, R. B. Dull, and H. G. Macpherson; <cite id="bib-10-5594-j16553">Characteristics of Intermittent Carbon ARCS</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 7, July 1941); SMPTE, 1941
<span class="doi">10.5594/J16553</span>
</li>