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

Page scan 000256 from Journal of the Society of Motion Picture Engineers

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 #:
000256
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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Sept., 1936] A 13.6-MM. SUPER-HIGH-INTENSITY CARBON 249 shows the foot-candle readings on a screen 15 X 20 ft. for the supercarbon at 180 amperes, for various light distributions with the optical system that has been described. The foot-candles are plotted against the distance from the center of the screen as illustrated by the diagram in the lower right-hand corner. For a distribution factor of 80 per cent at the sides of the screen, values are shown of 30 foot-candles at the center, 24 at the sides, and 18 foot-candles at the corners. If the distribution factor is 72 per cent at the sides, the 44 40 36 * " 2 U oo 00 oo C£tyr£# <s/i E cy#Mie -a* ao 7.'. *3 €0 s t/.a //.a FIG. 5. Effect of light distribution upon foot-candle reading on 15 Y^ 20-ft. projection screen (shutter of optical system not running). foot-candle reading at the center is 43, at the sides 31, and at the corners 22, and the total lumens upon the screen are increased from 7500 to 10,300. Cook4 and Rayton5 have pointed out that the effect of the complete optical system, when adjusted to give maximum light output, is to emphasize the contrast in intensity between the center and the edges of the screen. It is possible, however, by readjusting the focus, to compensate for this effect so that the light at the sides and corners is satisfactory. It is evident from Fig. 4 that for the light distributions actually measured in these tests the maxi