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

Page scan 000273 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 #:
000273
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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270 REES AND ANDERSON September hydroquinone were small enough to be considered constant and compensated for in the determination of Elon and hydroquinone. The magnitude of the basic mix (i.e., a mix containing all other constituents except Elon and hydroquinone) absorbancies was small enough so that a change of 50 per cent in the concentration of any of the basic mix ingredients did not significantly change the absorbancy. This is illustrated by the developer used in this work which contributed a blank absorbancy of 0.010 at 270 millimicrons and 0.008 at 290 millimicrons. The method has been applied successfully to all developers containing Elon and hydroquinone so far examined . The Elon and hydroquinone were Eastman Kodak chemicals and the inorganic chemicals were of photographic quality. The developer used in this work had the following composition: Constituent Concentration, Grams per Liter Sodium sulfite Elon Hydroquinone Sodium carbonate monohydrate Potassium bromide 45.0 (Refer to text) (Refer to text) 50.0 2.0 The chemicals were dissolved in the order given. Slight warming was occasionally applied to get the Elon into solution. It was important that the Elon was in solution before the hydroquinone was added to minimize the oxidation of the latter. Typical absorption curves for Elon, hydroquinone, and the complete developer mix are shown in Fig. 1. From examination of the curves, it will be seen that at 290 millimicrons, where the maximum absorption of hydroquinone appears, there is also some absorption by the Elon. However, by measuring the absorption at 270 millimicrons in addition to the measurement at 290 millimicrons, it was possible simultaneously to determine the amount of Elon and hydroquinone present in a developer. ANALYSIS OF FRESH DEVELOPERS Reagents pH. 5 acetate buffer. Add 23 grams of anhydrous sodium acetate to 58 milliliters of 2 molar acetic acid and dilute to 1 liter with distilled