Society of Motion Picture Engineers : incorporation and by-laws (1929)

Page scan 000435 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1929
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1929)
Leaf #:
000435
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
September 12, 2024
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Fine-Grain Developers — Carlton and Crahtree 419 Eloii and borax produce about an equal effect, weight for weight, the former to decrease and the latter to increase the alkalinity of the developer. The data on the molecular weights of borax and Elon check the above results. Borax (mol. wt. = 381) is dibasic when neutralized by strong acids and is neutralized by one molecule of sulfuric acid. Elon crystallizes with one-half mole of sulfuric acid per molecule so that two molecular weights of crystallized Elon (mol. wt. = 172, total weight 344) are required to neutralize one mole of the borax. Consequently, borax and Elon neutralize each other in weight ratios of 381 :344, which substantiates the result obtained from a study of the alkalinities of the developer. In these terms the borax developer formula is simplified as it actually occurs in solution. The borax and Elon, used in equal concentration (2 grams of each per liter), practically neutralize each other so that the developing solution is essentially a solution of Elon base (monomethyl para-amino phenol) and hydroquinone in a 10% solution of sodium sulfite. The alkalinity of the developer can be increased by increasing the quantity of borax. Fig. 4 gives time-gamma curves for the regular formula with increasing concentrations of borax up to 20 grams per liter and shows graphically how the rate of development Figure 4. Time-Gamma Curves for Increasing Quantities of Borax in the Regular Formula at 65°F. The Borax Content is Given in Grams per Liter. (Rack and Tank Method). (Eastman Negative Panchromatic Motion Picture Film, Type 2).