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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

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
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
Link
https://doi.org/10.5594/J07440
Author(s)
D. B. Joy, E. R. Geib
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J07440.json

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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
Snippet:
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
Snippet:
<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>

SMPTE Icon SMPTE's HTML Pub

Preview:
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
doi: 10.5594/J07440
url: https://doi.org/10.5594/J07440
Snippet:
<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>