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 #:
000699
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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682 J. I. CRABTREE AND H. D. RUSSELL [J. S. M. p. E. With D-76 at 70°F. (Fig. 5) the hardening properties of fixing bath No. II were very similar to those of fixing bath No. I. During exhaustion with 600 feet of negative film per gallon, a low degree of hardening was obtained before each revival point but after the addition of acid, a maximum degree of hardening was produced. This indicates that more uniform hardening properties could have been maintained by the addition of acid at more frequent intervals. From a study of the hardening properties of chrome alum fixing baths as represented in Figs. 1 to 5, it was concluded that (1) more uniform hardening properties could be maintained on exhaustion too ZOO 300 400 JOO 600 700 800 FIG. 5. Effect of exhaustion with acid revival on the hardening properties of chrome alum fixing bath No. II (D-76 developer at 70 °F.). with the No. II formula than with No. I ; (2) more uniform hardening properties were maintained at 85 °F. than at 70°F. ; and (3) the acidity must be maintained between a pH of 3.0 and 3.8 in order to maintain satisfactory hardening properties on exhaustion. (4) Method of Revival with Acid. — The quantity of acid to be added at each revival point was determined by the following method: A 25 cc. sample of the fixing bath was added to 50 cc. of distilled water containing 5 cc. of brom-phenol-blue indicator and titrated with a