Transactions of the Society of Motion Picture Engineers (1929)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1929
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1929)
Leaf #:
000440
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:
November 17, 2022
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424 Transactions of 8.M.P.E., Vol. XIII, No. 38, 1929 The developers were stored in closed earthenware jugs and tested every week by the regular H. & D. methods. The data obtained are recorded in Table IV. The results for any time of development show that with the regular borax developer the rate of development increased with keeping. The gamma for 12 minutes' development increased from 0.78 to 1.19 in 49 days. With the buffered developer the rate of development remained constant within the limit of error for the 49 days of keeping. For sensitometric purposes which depend upon the development factors remaining constant over a period of several weeks, the buffered borax developer is preferable to the regular formula. Table IV ffect of Aging on the Regular and Buffer •ed Borax 1 develops Begular Borax Developer 6 min. 9 min. 12 min. 15 min. 18 min. Bays gamma gamma gamma gamma gamma 0 0.50 0.67 0.78 0.92 1.05 8 .53 .74 .86 .97 1.03 14 .51 .71 .89 .96 1.08 22 .60 .73 .91 1.03 1.12 28 .53 .76 .87 1.07 1.17 35 .58 .81 .95 1.05 1.15 42 .67 .92 1.01 1.10 1.24 49 .79 .99 1.19 1.43 1.45 Buffered Borax Developer 0 0.44 0.61 0.78 0.90 1.04 8 .46 .62 .79 .94 1.01 14 .46 .62 .79 .94 1.01 22 .49 .61 .82 .95 1.03 28 .45 .61 .77 .90 1.06 35 .46 .68 .87 .99 1.08 42 .48 .67 .80 .96 1.08 49 .47 .65 .85 .98 1.08 A series of tests were made to find the effect of aeration upon the rate of development with the regular borax developer. The results are shown in Table V in terms of the gamma values for the various times of development. The effect of passing carbon dioxide into the developer was to decrease the rate of development. The carbon dioxide hydrolyzed to give carbonic acid which decreased the alkalinity of the developer.