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

Page scan 00030 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 #:
00030
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 23 Take a 50-ml sample of fixing bath, make alkaline with ammonium hydroxide, filter, and wash with hot ammonium nitrate solution. Dissolve the precipitate in very dilute acetic acid solution and dilute to 250 ml with distilled water. Heat 10 ml of this solution to about 70 C and add 10 ml of 8-hydroxyquinoline reagent (25 gm 8-hydroxyquinoline in 60 ml glacial acetic acid, diluted to 2 liters with cold water) and 25 ml of 2 TV ammonium acetate solution. Dilute to 100 ml and let stand until the precipitate settles. Add one ml of the supernatant liquid to 5 ml of 2 N ammonium acetate and 3 drops of 6 per cent gelatin. Dilute to 20 ml and determine polarographically the 8-hydroxyquinoline concentration. 140 120 I 00 80 60 40 20 0-.2 -4 -.6 -.8 -1.0 -1.2 -1.4 -1.6 -1.8 VOLTS FIG. 1. 8-Hydroxyquinoline. The difference in the value obtained and the 8-hydroxyquinoline concentration in the reagent diluted as described is the amount which reacted with the aluminum. A typical 8-hydroxyquinoline curve is shown in Fig. 1. The wave starts at a potential of about — 0.8 v and levels at a potential of about — 1.2 v. Typical diffusion current constants are shown in Table 1 . Sample Calculation. — If id = 2.197 /za, m = 2.2019 mg per sec, t = 2.68 sec, and