Journal of the Society of Motion Picture Engineers ( Volume: 23, Issue: 1, July 1934)

[ACTIVE]

The Relation of the High-Intensity A-C. ARC to the Light on the Projection Screen

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 23, No. 1, pp. 35–47
Abstract: The effect on the amount and uniformity of light on the projection screen of changing the position of the arc with respect to the reflector, varying the arc length, decreasing the current, and irregular feeding of the carbons is measured and discussed. The importance of proper draft conditions in the lamp house is emphasized. The comparatively low temperature at the film aperture for a given amount of light on the projection screen from this type of arc is demonstrated. The unique wave-form of the screen light from this high-intensity alternating-current arc is compared with the wave-form of the screen light from the low-intensity alternating-current neutral cored carbon arc and the rectified neutral cored carbon arc. A logical explanation is furnished by a consideration of these wave-forms for the comparative freedom from light beat or fluctuation with this type of alternating-current arc. It is pointed out that this arc gives no greater light fluctuation on the screen than the arc from rectified current. Other causes of fluctuation of the screen light are cited and suggestions are given for minimizing their effects.
Publication Date: 1934-07-01
DOI: 10.5594/J07440
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J07440
Author(s): D. B. Joy
E. R. GeibNational Carbon Co., Cleveland, Ohio
Copyright: © 1934 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Joy D. B. Downes A. C. : “A New Alternating-Current Projection Arc,” J. Soc. Mot. Pict. Eng. , XXI (Aug., 1933 ), No. 2 , p. 116 . EXTERNAL
2 Joy D. B. Geib E. R. : “Operating Characteristics of the High-Intensity Alternating-Current Arc for Motion Picture Projection,” J. Soc. Mot. Pict. Eng. , XXIII (July, 1934 ), No. 1 , p. 27 . EXTERNAL
3 Joy D. B. Downes A. C. : “Some Causes of Variations in the Light and Steadiness of High-Intensity Carbons,” J. Soc. Mot. Pict. Eng. , XVI (Jan., 1931 ), No. 1 , p. 61 . EXTERNAL
4 Joy D. B. Downes A. C. : “Properties of Low-Intensity Reflecting Arc Projector Carbons,” J. Soc. Mot. Pict. Eng. , XVI (June, 1931 ), No. 6 , p. 684 . EXTERNAL

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D. B. Joy and E. R. Geib; The Relation of the High-Intensity A-C. ARC to the Light on the Projection Screen, Journal of the Society of Motion Picture Engineers ( Volume: 23, Issue: 1, July 1934); SMPTE, 1934. Available at https://doi.org/10.5594/J07440

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D. B. Joy and E. R. Geib; The Relation of the High-Intensity A-C. ARC to the Light on the Projection Screen, Journal of the Society of Motion Picture Engineers ( Volume: 23, Issue: 1, July 1934); SMPTE, 1934. Available at https://doi.org/10.5594/J07440

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<span class="citation">D. B. Joy and E. R. Geib; <cite>The Relation of the High-Intensity A-C. ARC to the Light on the Projection Screen</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 23, Issue: 1, July 1934); SMPTE, 1934. Available at <a href="https://doi.org/10.5594/J07440" target="_blank" rel="noopener">https://doi.org/10.5594/J07440</a></span>

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<li>
D. B. Joy and E. R. Geib; <cite id="bib-10-5594-j07440">The Relation of the High-Intensity A-C. ARC to the Light on the Projection Screen</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 23, Issue: 1, July 1934); SMPTE, 1934
<span class="doi">10.5594/J07440</span>
</li>