Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000315
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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298 D. B. JOY AND A. C. DOWNES [J. S. M. P. E. the red region for the lower currents on the carbons. As these currents are increased as evidenced by the curves for the 13.6 mm. carbons, the red end of the curve increases faster than the blue so that at the high currents there is actually an appreciable preponderance of red as compared with blue. This is contrary to the distribution curves given in the Bureau of Standards Scientific Paper No. 539, but, as stated previously, the measurements tabulated in that paper were ANGSTROM UNITS ULTRAVIOLET VIOLET BLUE GBCCN YELLOW FIG. 7. Spectral energy distribution curves. made on the unscreened arc and included the light from the negative arc stream and tail flame which amounts to approximately 32 per cent of the total light and which is known to give a decided peak of energy in the blue and near ultra-violet end of the spectrum. This tail flame and negative arc stream light is not picked up by the optical system commonly used in either the Sun Arc or projection lamps and is not therefore a factor. It would seem from these energy distribution curves in Fig. 7 that the high intensity arc, particularly at the higher currents, is a very desirable light source for use in motion picture photography.