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

Page scan 000189 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 #:
000189
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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182 F. L. EICH [J. S. M. P. E. measuring densities on the Bausch & Lomb polarizing densitometer and then by the photoelectric device (Fig. 4). The accuracy of the device has been found to be within 0.005 in density, and readings are consistently duplicated. Ease of operation and the increased accuracy over the visual type of densitometer FIG. 2. Details of densitometer: (1) photronic cell; (2) aperture; (3) condensing lens; (4) reflector and lamp; (5) microammeter; (6) current supply for lamp. are great advantages. Paramount, of course, is the fact that visual fatigue, which is an important factor in measuring densities with the visual type of densitometer, is eliminated. A disadvantage of the single-range instrument is that densities above 1.0 fall within a very narrow portion of the meter scale, and measurements of those densities are therefore not very accurate. However, by using a more sensitive meter and constant-resistance shunt networks of the attenuator type used in communication work, multiple ranges can be attained.