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

Page scan 00034 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 #:
00034
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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July, 1945 APPLICATION OF THE POLAROGRAPH 27 Silver. — A well-defined diffusion current is obtained from the reduction of silver thiosulfate ion from a solution of sodium thiosulfate.11 This wave starts from 0 applied potential. To assure a large concentration of thiosulfate ions, 10 ml of 0.1 TV sodium thiosulfate were used as the base electrolyte. One ml of the unknown fixing bath and 3 drops of 6 per cent gelatin to prevent maxima were added. This solution was diluted to 20 ml and placed in the elec 600 500 400 300 200 +.8 -.6 +4 t2 0 -2 -4 -.6 -.8 -1.0-1.2 VOLTS FIG. 4. Silver. trolysis cell for polarographic determination. A typical wave is shown in Fig. 4. It is advisable to make a determination on a blank solution, so that any current carried by the base solution alone may be subtracted from the current carried by the silver and the base solution. To determine the diffusion current constant /, known quantities of silver nitrate were added to a fixing bath and the diffusion currents were measured as described above. The diffusion current constants thus found are reported in Table 1. The average value was used in analysis.