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 — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 37, No. 11, pp. 485–501
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
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J01247
Author(s): D. J. Zaffarano
W. W. Lozier
D. B. Joy
Copyright: © 1941 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Joy D. B. Downes A. C. : “Direct-Current High-Intensity Arcs with Non-Rotating Positive Carbons,” J. Soc. Mot. Pict. Eng. , XXII (Jan., 1934 ), No. 1 , p. 42 . EXTERNAL
2 Joy D. B. Geib E. R. : “The Non-Rotating High Intensity D-C Arc for Projection,” J. Soc. Mot. Pict. Eng. , XXIV (Jan., 1935 ), No. 1 , p. 47 . EXTERNAL
3 Lozier W. W. Joy D. B. Simon R. W. : “A New Negative Carbon for Low-Amperage Trims,” J. Soc. Mot. Pict. Eng. , XXXV (Oct., 1940 ), No. 4 , p. 349 . EXTERNAL
4 We wish to acknowledge the generosity of the W. M. Chace Co. of Detroit, Mich., and the H. A. Wilson Co. of Newark, N. J., in furnishing us thermostatic bimetal and platinum-faced contacts for our experimental work. EXTERNAL

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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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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>
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Referenced By

Screen Illumination with Carbon Arc Motion Picture Projection Systems [Active]