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 #:
00011
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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8 BATES AND RUNYAN July continuous strips is of great value in controlling the machine. By connecting the points as the graph is constructed, a running record is obtained of the speed and color-balance fluctuations. Speed increases in reversible film are denoted by a drop in all layer densities, a speed decrease by a rise in all densities, while color-balance shifts are denoted by unequal changes in the various layer densities. As can be seen from Fig. 4, minor fluctuations in over-all speed and GRAPHICAL RECORD OF MACHINE OPERATION -MAGENTA •CYAN • YELLOW 6AM 12PM 4PM 8PM 12AM CONSECUTIVE CONTROL STRIPS APPROX. 1/2 HR. INTERVALS 3 30AM Fig. 4 very slight deviations in color balance occur between successive developments. These fluctuations are normal in the best regulated machines made to date and are caused by a variety of effects all minor in character but which add up to measurable differences. The variables which cannot be absolutely controlled include slight differences in film emulsions, film exposures, chemicals, solution mixes, developing times and temperatures, circulation rates, drying conditions, and even final densitometry. These additive deviations may amount to as much as plus or minus !/4 stop speed variation as well as color-balance shifts of plus or minus l/s stop. It is the controlman's responsibility to distinguish between a fluctuation that is within the