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 #:
000697
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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680 J. I. CRABTREE AND H. D. RUSSEU, [J. S. M. P. E. acid. Except in the case of a few samples which were taken after revival, the hardening properties of practically all the samples decreased after standing one week. The low degree of hardening obtained with the samples taken before revival indicates that the revival points should be more frequent in order to maintain uniform hardening properties. A comparison between the acidity curve of the fresh bath and the one after the samples had stood one week indicates that (1) the acidity tends to reach a constant value on ageing, (2) the 3/7* R f^EVIVAL. 3.0 4-0 ZOO 300 100 500 700 BOO FIG. 3. Effect of exhaustion with acid revival on the hardening properties of chrome alum fixing bath No. II (D-16 developer at 70 °F.). acidity must be maintained between a pH of 3.0 and 3.8 in order to obtain satisfactory hardening properties in the fresh bath, and (3) the hardening properties after standing one week decreased even when the acidity was between these pH values. With D-16 at 70°F. (Fig. 3) the hardening properties of fixing bath No. II were superior to those of fixing bath No. I. In the fresh bath 325 feet of film per gallon were processed with acid revival at the 100 foot and 200 foot stages before a decrease in the hardening properties occurred. The hardening properties were then restored by the addition of acid but decreased after processing 450 feet of film. The addition of acid revived the hardening action and the bath was further