Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 3, March 1940)

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Large Size Non-Rotating High-Intensity Carbons and their Application to Motion Picture Projection

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 34, No. 3, pp. 241–251
Abstract: The high-intensity, direct-current arc between small, copper-coated carbons operated in coaxial alignment without rotation with a reflector optical system has achieved a widespread and growing popularity over the past few years for theatrical projection of motion pictures. This type of light-source has now been extended to include larger carbons and higher currents. These larger carbons of this type with the proper optical system will give substantially higher light on the motion picture screen. Fundamental facts about the arc behavior and the conditions necessary to obtain stable and steady operation with these larger carbons are described. The correlation of the luminous characteristics of the arc with the optical system is reviewed. The performance of a new arc with a suitable optical system is given from the standpoint of offering possibilities for projection. Carbon consumption rates, arc current and voltage, and light on the screen are discussed.
Publication Date: 1940-03-01
DOI: 10.5594/J10092
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J10092
Author(s): D. B. Joy
W. W. Lozier
R. W. SimonNational Carbon Company, Fostoria, Ohio
Copyright: © 1940 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Bassett P. R. : “The High Power Arc in Motion Pictures,” Trans. Soc. Mot. Pict. Eng. , No. 11 ( 1920 ). EXTERNAL
10 Cook A. A. : “A Review of Projector and Screen Characteristics and Their Effects upon Screen Brightness,” J. Soc. Mot. Pict. Eng. , XXVI (May, 1936 ), p. 522 . EXTERNAL
11 We gratefully acknowledge the services of the Bausch & Lomb Optical Company in supplying the f/2.0 experimental reflector and 4-inch f/2.0 experimental Cinephor type projection lens used in these tests. EXTERNAL
12 Report of the Projection Practice Committee, J. Soc. Mot. Pict. Eng. , XXIX (July, 1937 ), p. 39 . EXTERNAL
2 Benford F. : “The High Intensity Arc,” Trans. Soc. Mot. Pict. Eng. , No. 24 ( 1925 ), p. 71 . EXTERNAL
3 Bassett P. R. : “The Progress of Arc Projection Efficiency,” Trans. Soc. Mot. Pict. Eng. , No. 18 ( 1924 ), p. 24 . EXTERNAL
4 Stark S. : “Reflector Arc Projection'Some Limitations and Possibilities in Theory and Practice,” Trans. Soc. Mot. Pict. Eng. , No. 23 ( 1926 ), p. 94 . EXTERNAL
5 Joy D. B. Downes A. C. : “Direct-Current High-Intensity Arcs with Non-Rotating Positive Carbons,” J. Soc. Mot. Pict. Eng. , XXII (Jan., 1934 ), p. 42 . EXTERNAL
6 Joy D. B. Geib E. R. : “The Non-Rotating High-Intensity D-C Arc for Projection,” J. Soc. Mot. Pict. Eng. , XXIV (Jan., 1935 ), p. 47 . EXTERNAL
7 Bassett P. R. : “The Electrochemistry of the High-Intensity Arc,” Trans. Amer. Electrochem. Soc. , XLIV ( 1923 ), p. 153 . EXTERNAL
8 Hardy A. C. : “The Distribution of Light in Optical Systems,” J. Frank Inst. , 208 (Dec., 1929 ), p. 773 . EXTERNAL
9 Hardy A. C. : “The Optics of Motion Picture Projectors,” J. Soc. Mot. Pict. Eng. , XIV (March, 1930 ), p. 309 . EXTERNAL

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D. B. Joy, W. W. Lozier, and R. W. Simon; Large Size Non-Rotating High-Intensity Carbons and their Application to Motion Picture Projection, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 3, March 1940); SMPTE, 1940. Available at https://doi.org/10.5594/J10092

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D. B. Joy, W. W. Lozier, and R. W. Simon; Large Size Non-Rotating High-Intensity Carbons and their Application to Motion Picture Projection, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 3, March 1940); SMPTE, 1940. Available at https://doi.org/10.5594/J10092

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<span class="citation">D. B. Joy, W. W. Lozier, and R. W. Simon; <cite>Large Size Non-Rotating High-Intensity Carbons and their Application to Motion Picture Projection</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 3, March 1940); SMPTE, 1940. Available at <a href="https://doi.org/10.5594/J10092" target="_blank" rel="noopener">https://doi.org/10.5594/J10092</a></span>

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<li>
D. B. Joy, W. W. Lozier, and R. W. Simon; <cite id="bib-10-5594-j10092">Large Size Non-Rotating High-Intensity Carbons and their Application to Motion Picture Projection</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 3, March 1940); SMPTE, 1940
<span class="doi">10.5594/J10092</span>
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