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 #:
000677
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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674 LEVENSON December electrode and a high-salt buffer as described in a previous paper.7* Analyses of the air in the spray cabinet were made by drawing off a 50-milliliter sample of air and absorbing the oxygen in alkaline pyrogallol in a Hempel pipet. The air was sampled through a cock fitted in the back panel of the spray cabinet about 9 inches from the bottom. Ordinary photographic grade ' 'Kodak-Tested" chemicals were used, and tap water was employed in all the runs involving a large volume of solution. TIME (HOURS) Fig. 6 — Change of composition of the positive developer at pH 10.5 in two runs in the S-R Spray system. At the outset the survey was based on D76d, as a typical negative developer, and the following positive developer : Elon 1 . 72 grams Hydroquinone 3 . 30 grams Sodium sulfite 37. 8 grams Sodium carbonate 21.2 grams Water to 1 liter In a number of makings the pR of the D76d varied between 8.6 and 8.8. The pH. of the positive developer was adjusted with sodium hydroxide to 10.5 =*= 0.05. This somewhat high level was deliberately chosen so as to extend the pK range covered. Later, in the * NOTE: The pH values obtained in this way, in the IN NaCl buffer using an AgCl/0.1 N KC1 reference electrode, read 0.3 unit higher than the values that would be obtained using a saturated calomel electrode in any buffer,