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 #:
000559
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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556 BERKLEY AND MANSBERG November short, that a portion of the recording is lost. If the pattern to be photographed is clear, stationary, and reproducible on the oscillograph, no difficulty is usually encountered if the proper exposure is given. Often the pattern lacks these requisites. For example, the pattern is frequently disturbed by some transient condition such as slow linevoltage variations. Or, we may be interested in the output of a transmitter upon which is superimposed some unregulated direct-current level. If we were to give the exposure called for in the tables, the result would appear as in the right figure of Fig. 8, the various Fig. 9 — Deliberately overexposed saw-tooth oscillogram to record fast rise time. traces not being superposed. If sufficient brightness is available, this problem may be overcome by shortening the exposure just enough so that we effectively stop the motion of the phenomenon. This is analogous to stopping the motion of a high-speed moving object in standard photography. The published tables of the proper exposure to give are based upon certain average, normal conditions. In some cases, modifications of these exposures have to be made. For example, Fig. 9 shows an oscillogram of a perfectly reproducible saw tooth. But this is a good saw tooth and the saw time is much greater than the return time, so that if the recording is properly exposed for the saw, it will be