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

Page scan 000388 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 #:
000388
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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April, 1941] LATENT IMAGE STABILITY OF FILM 383 3/4 to 2J/2 stops. The two positive films which, of course, were not sensitized, showed no change and a decided regression of the latent image, respectively. Furthermore, it is apparent that the greatest intensification of the latent image is to be found on films with a high initial sensitivity. The high-speed films showed an increase in speed of approximately 2 stops, medium-speed I1/2to2, and the slow-speed films 1 stop, while with infrared there was a 3/4 of a stop increase. This confirms Bullock's claim that the degree of latent image intensification varies with the initial emulsion speed. DEVEUOFED O WEEKS AFTER EXPOSURE. #/ •3 .6 .9 /.z /.s /e z.i z.+ 2.7 3.0 FIG. 8. Latent image age effect on motion picture positive film no. 8. Bullock noted that the advance in speed is most pronounced at densities near 0.6 which was confirmed on several films. However, our tests showed sufficient exceptions for us to conclude that this initial increase in speed in the neighborhood of 0.6 is not a necessary accompaniment of latent image age. The shoulder of the characteristic curve does not show as marked an image growth as do the lower densities. In some cases, in fact, a regression may occur at extremely high densities. This indicates that the intensification or growth effect depends upon the exposure and may reverse itself at high levels. The densities at which no growth or decay takes place, i, e., at which the two characteristic