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 #:
000217
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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200 LOYD A. JONES AND OTTO SANDVIK [j. s. M. p. E. focus has to be carried out with the utmost care. A displacement of the objective lens, imaging the slit on the film, by a small fraction of a millimeter causes a change from excellent definition, that is, a high modulation in the density, in one case, to a practically uniform density in the other. In Fig. 12 are micro-densographs of variable density sound records of several different constant frequencies as indicated. These in themselves do not convey much information, but wave form analyses and a study of the various types of distortions and their 15 10 LOO EXPOSURE. 1.5 3.0 FIG. 14. Curve showing growth of diameter of the photographic image with the log exposure. causes will be the subject of a future communication and we shall not devote any space to it in the present paper. Fig. 13 is a photomicrograph of a variable area sound record of 8000 cycle frequency. The definition is not perfect, yet the volume depression at this frequency from that cause certainly would not be very large. The necessity for careful adjustment of the optical system in the reproducer is also of great importance because a decentered filament image on the slit causes a reduction in volume and introduces micro