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 #:
000518
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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May, 1930] STOP BATHS AND FIXING BATHS 501 positive film were developed in D-16 at 70°F. and processed in a manner similar to that described on page 486 for alkaline film. The effect of exhaustion on the hardening properties of 2 per cent and 3 per cent plain chrome alum stop baths is shown in Fig. 8. The hardening properties of the 2 per cent bath decreased rapidly after 200 feet of film per gallon had been processed, which may be considered as the life of the fresh bath. After storing for two weeks, the hardening life of the bath decreased to 100 feet per gallon. The CHROME: A.LUM P-lfe 10*F ioo ^oo soo 100 zoo FIG. 8. Effect of the exhaustion without acid revival on the hardening properties of 2 per cent and 3 per cent chrome alum stop baths (D-16 developer, 70 °F.). change in acidity during the processing of 250 feet of film per gallon was from a pH of 3.2 to a pH of 5.0 at which point a chromium sludge precipitated on standing. A maximum degree of hardening was obtained in the fresh 3 per cent bath throughout the entire period of processing 300 feet of film but after storing for two weeks the life of the bath decreased to 200 feet of film per gallon. The acidity changed from a pH of 3.2 to a pH of 4.2 during the exhaustion with 300 feet per gallon, which was not as great as the acidity change in the 2 per cent bath under similar conditions. No sludges were formed in the 3 per cent bath even after standing for two weeks at 70° F.