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 #:
00033
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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30 BRUNNEK, MEANS, AND ZAPPERT July silver wire and calomel electrodes (Fig. 1). With this procedure the thiocyanate was determined with an accuracy of 100 =t 1 per cent. Determination of Ferrocyanide in Bleach Ansco color bleach A-713 has the following composition: Dipotassium Mono Sodium Ferricyanide or Potassium Ferricyanide 100 Grams Potassium Bromide 15 Grams Dibasic Sodium Phosphate 40 Grams Sodium Bisulfate 25 Grams Water to make. . • 1 Liter ML. O.IN SILVER NITRATE Fig. 1 — Titration curve for bromide plus thiocyanate. During use some of the ferricyanide is reduced to ferrocyanide. Varden and Seary8 described a colorimetric procedure for the rapid determination of color bleach exhaustion. When the bleach solution is to be regenerated with bromine as described by Bates and Runyan,1 the concentration of ferrocyanide must be determined more accurately than is possible with the colorimetric method. Standard textbooks on chemical analysis describe the determination of ferrocyanide in acid solution by tit ration with potassium permanganate or eerie sulfate. Either of these oxidants may be used with bleach A-713, but because of the deep color of the solution, the titration must be followed potentiometrically. In the permanganate titration, considerable time is required for the potential to reach equilibrium as the end-point is