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

Page scan 000255 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 #:
000255
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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248 D. B. JOY [J. S. M. P. E. against the distribution. This gives a direct comparison of the amount of light obtained from these carbons at the various currents and for the distributions noted in the figure. For example, for a distribution factor from the center to the sides of 80 per cent, and from the center to the corners of 60 per cent, the regular carbon at 130 amperes provides 5700 lumens on the screen and the super-carbon at 180 amperes 7500 lumens. These values, and, to some extent, the distribution of the light, depend upon the design of the optical system4'5'6 as well as upon the light from the arc; but tfNTEK. 100 IOO 100 j/Z^J 84 32 SO coeneeses 63 so 7B IOO /OO /OO 76 74 72 tt.s 53 so.s /OO 70 FIG. 4. Light on projection screen for various distributions of the light (shutter of optical system not running). since the same optical system was used for all these measurements, the figures are directly comparable. It is evident that the supercarbon at either 160 or 180 amperes affords a distinct increase in light over the regular carbon at its highest rated current of 130 amperes. This advantage holds for the light distributions commonly encountered. These data emphasize the necessity of making comparative measurements upon the basis of the same light distribution on the screen. The effect of the distribution is better illustrated by Fig. 5 which