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 #:
000464
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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448 Transactions of S.M.P.E., Vol. XIII, No. 38, 1929 developer which gives a satisfactorily fine grain with maximum effective emulsion speed is to be desired. A sulfite concentration of 75 grams per liter was found to give satisfactorily grain free images, and at the same time to give a high effective emulsion speed. Borax The borax appears to influence the development only through its effect on the alkalinity of the solution, and hence, its effect can be completely presented only in conjunction with other factors affecting the alkalinity of the developer. For the simple case, varying borax only, Fig. 3 shows the effect on the development for the 8 o yX^O 20 ~ ^--^ -^°^ /O /.s 0 1.0 Density 0^^-°^ OS ,^'^ X Lo£ £ 0.0 0.6 /2 /* 21 3.0 Figure 3. Eight minute developments with: Sodium sulfite, 75 g/1; metol, 2.5 g/1; borax, varied. Emul. 2568. Curve Borax pH Fog 1 0 8.7 .03 2 2.5 8.7 .07 3 5 9.0 .07 4 10 9.1 .06 minute period chosen. Increasing the borax increases the alkalinity (represented by increasing pH) with a resultant increase in the activity of the developer. With the quantity of metol used in this series, there is little difference between development with 5 and 10 gm/1. of borax. Reducers In the first series of tests with its low borax concentration it soon became evident that the hydroquinone did little of the development. When the basic formula indicated for this series was mixed