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 #:
000281
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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278 REES AND ANDERSON September 260 280 300 320 Wavelength mM dy w monosulfonate and Elon. A, Elon monosulfonate. B, solution A after extraction. C, solution A with Elon added. D, solution C after extraction. Dilute l.OOmilliliter of theunextracted developer with 100 milliliters of acetate buffer and determine the absorbancies at 270 millimicrons and 290 millimicrons. Subtract the corrected absorbancies after extraction from the absorbancies before extraction and, using these differences, determine the concentration of Elon and hydroquinone from the grid or by calculation from the equations. This extraction procedure should be checked on a basic mix in order to determine if the ethyl acetate is extracting any material in addition to Elon and hydroquinone. If this is the case, a blank value should be subtracted from the absorbancies before referring to the grid. Separation of Elon and Hydroquinone from Oxidation Products A mix was prepared containing 6.00 grams per liter of Elon and 3.00 grams per liter of hydroquinone. Exposed film was processed in this developer solution until the Elon concentration had dropped to 5.51 grams per liter and the hydroquinone to 2.48 grams per liter. The absorption curve of the extracted developer was determined and corrected for the dilution due to the sulfuric acid which had been added. The absorption curve of the developer solution before extraction was also determined. The difference between these two curves was obtained and the result is shown in Fig. 7. If the procedure extracts Elon and hydroquinone only, and in the amounts as shown by the 240 260 280 300 320 340 Wavelength m>i Fig. 7 — Absorption curve of extracted material compared to the absorption curve of Elon and hydroquinone. O, extracted material from used solution; A, hydroquinone plus Elon in fresh solution.