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

Page scan 000440 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 #:
000440
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, 1930] TESTING FOR SODIUM 423 From an exhaustive series of tests it has been found that the rate of fading of a silver image in air free from sulfur compounds depends upon the following factors: (a) The size of the grains which comprise the image. (b) The temperature and humidity of the air during storage. (c) The quantity of hypo or other sulfur-containing compounds retained in the image. (d) The relative acidity or alkalinity of the gelatin film Containing the image. FIG. 1. Illustration of method of conducting fading tests. The size of the image grains is, perhaps, the most important factor involved. With images such as exist on motion picture film, it is somewhat difficult to produce fading even in the presence of appreciable quantities of hypo, whereas with extremely fine-grained images fading may take place in a few hours' time under the above test conditions, even in the presence of relatively small quantities of hypo. A maximum degree of immunity to fading exists, therefore, with well-washed images which are stored in a dry atmosphere at a temperature which does not exceed 70°F. to 75°F.