Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 6, June 1931)

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Properties of Low Intensity Reflecting Arc Projector Carbons

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 16, No. 6, pp. 684–694
Abstract: The characteristics of the latest type of low intensity reflecting arc carbons (which are capable of burning at higher currents than those previously available) are presented. These include current capacity, candle-power, angular light distribution, crater diameter, and intrinsic brilliancy. These characteristics are discussed in relation to the optical system. It is shown that although the maximum screen light from the present optical system as determined by photometric measurements can be obtained at a comparatively low current, there are decided practical advantages in using a higher current and larger carbons than the minimum theoretically possible. It is also demonstrated that the faster projection lenses now available, together with a change in the magnification of the reflector system, should make possible an increase of theoretically 75 per cent in screen light over that now available with the present system. This increased screen light will have the same uniformity, flexibility, and factor of safety as that now obtained, provided the correct carbons and currents are used.
Publication Date: 1931-06-01
DOI: 10.5594/J08042
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J08042
Author(s): D. B. Joy
A. C. DownesResearch laboratories, National Carbon Co., Cleveland, Ohio
Copyright: © 1931 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Mott W. R. Kunzmann W. C : “Efficiency in Carbon Arc Projection,” Trans. Soc. Mot. Pict. Eng. , No. 16 ( 1923 ), p. 143 . EXTERNAL
2 “Illumination Data for Low Intensity Ares,” Motion Picture News (April 6, 1921 ), p. 1097 . EXTERNAL
3 Benford Frank : “The High Intensity Arc,” Trans. Soc. Mot. Pict. Eng. , No. 24 ( 1926 ), p. 71 . EXTERNAL
4 Joy D. B. Downes A. C : “Characteristics of High Intensity Ares,” J. Soc. Mot. Pict. Eng. , XIV (March, 1930 ), p. 291 . EXTERNAL
5 Bassett P. R. : “The Progress of Arc Projection Efficiency,” Trans. Soc. Mot. Pict. Eng. , No. 18 ( 1924 ), p. 24 . EXTERNAL
6 Stark Sander. : “Reflector Arc Projection—Some Limitations and Possibilities in Theory and Practice,” Trans. Soc. Mot. Pict. Eng. , No. 23 ( 1926 ), p. 94 . EXTERNAL

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D. B. Joy and A. C. Downes; Properties of Low Intensity Reflecting Arc Projector Carbons, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 6, June 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J08042

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D. B. Joy and A. C. Downes; Properties of Low Intensity Reflecting Arc Projector Carbons, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 6, June 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J08042

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<span class="citation">D. B. Joy and A. C. Downes; <cite>Properties of Low Intensity Reflecting Arc Projector Carbons</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 6, June 1931); SMPTE, 1931. Available at <a href="https://doi.org/10.5594/J08042" target="_blank" rel="noopener">https://doi.org/10.5594/J08042</a></span>

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D. B. Joy and A. C. Downes; <cite id="bib-10-5594-j08042">Properties of Low Intensity Reflecting Arc Projector Carbons</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 6, June 1931); SMPTE, 1931
<span class="doi">10.5594/J08042</span>
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Referenced By

Progress in the Motion Picture Industry [Active]