Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941)

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Improved Methods of Controlling Carbon Arc Position

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: This paper shows, both from previous data and fundamental considerations, the close control of carbon position necessary to obtain constant light on the projection screen, particularly with reflector-type high-intensity carbon arc lamps. Review of the characteristics of this type of lamp and optical system reveals that in order to obtain constant light on the screen it is necessary to avoid variation of carbon position and changes in arc current due to line-voltage fluctuations. Methods of arc control employing photoelectric cells and bimetallic thermostats directly responsive to carbon position have been analyzed with regard to their applicability for this purpose. Some examples of these have been constructed and have demonstrated that automatic devices of simple construction are capable of maintaining constant the intensity, distribution, and color of the light on the projection screen.
Publication Date: 1941-11-01
DOI: 10.5594/J01247
Link: https://doi.org/10.5594/J01247
Author(s): D. J. Zaffarano, W. W. Lozier, D. B. Joy

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D. J. Zaffarano, W. W. Lozier, and D. B. Joy; Improved Methods of Controlling Carbon Arc Position, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J01247

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D. J. Zaffarano, W. W. Lozier, and D. B. Joy; Improved Methods of Controlling Carbon Arc Position, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J01247

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<span class="citation">D. J. Zaffarano, W. W. Lozier, and D. B. Joy; <cite>Improved Methods of Controlling Carbon Arc Position</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J01247" target="_blank" rel="noopener">https://doi.org/10.5594/J01247</a></span>

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<li>
D. J. Zaffarano, W. W. Lozier, and D. B. Joy; <cite id="bib-10-5594-j01247">Improved Methods of Controlling Carbon Arc Position</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941
<span class="doi">10.5594/J01247</span>
</li>