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 #:
000523
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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506 J. I. CRABTREE AND H. D. RUSSEU, [J. S. M. p. E. With the 2 per cent bath, the hardening properties on exhaustion with D-76 at 85°F. were inferior to those of the other baths investigated (Fig. 13). Revival with acid every 100 feet per gallon increased the hardening action at these points but the hardening decreased rapidly on further exhaustion. After 300 feet of film per gallon had been processed, satisfactory hardening properties were not maintained. The low temperature at which the film reticulated before each 100 ZOO 300 400 500 <bOO TOO &00 FIG. 13. Effect of exhaustion with acid revival on the hardening properties of a plain 2 per cent chrome alum stop bath (D-76 developer, 85 °F.). revival indicates that the bath should have been revived more frequently. The age of the stored samples had little effect on the hardening properties. SUMMARY The function of a chrome alum stop bath is to arrest development and harden the emulsion before fixing. It also prolongs the life of an alum fixing bath by virtue of preventing the addition of alkali. This, in turn, serves to maintain the hardening properties of the fixing bath and prevent sludging. At normal temperatures it is not necessary to harden the gelatin coating of motion picture film to the extent produced by chrome