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

Page scan 00025 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 #:
00025
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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20 CRABTREE, EATON, AND MUEHLER [J. S. M. P. E. changes in the rate of removal of hypo as shown in Table III. These pH effects were further verified when the pH of the exhausted baths was adjusted to the />H value of the fresh bath. (b) Effect of Silver Content on Removal of Silver and Hypo. — As mentioned previously, the concentration of silver in the clear portions of the film is almost as important with respect to permanence as the residual hypo in the film. As is the case with hypo, if the storage 0.14 FRESH AGO EXHAUSTION (FEET 35 mm. FILM PER GAL.) FIG. 3. Effect of exhaustion of fixing bath on hypo and silver content after washing. Eastman Super-XX Panchromatic Negative Film, Type 1232. Fixed in Kodak F-5. Washed 5 minutes at 68°F. pH of fixing bath maintained at 4.1. pH. of fixing bath increased with exhaustion to 5.5. conditions with film or prints are favorable, the silver thiosulfate complexes are not particularly harmful in the absence of hydrogen sulfide in the air. However, if any unfavorable change occurs in these conditions, the complexes decompose to produce a yellow stain of silver sulfide which is proportional in intensity to the quantity of silver retained. A study was therefore made of the effect of the degree of exhaustion, the pH during exhaustion, and the degree of washing on the relative quantities of silver and hypo retained by the film. Unexposed Eastman Motion Picture Super-XJ^ Panchromatic