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

Page scan 000465 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 #:
000465
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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Borax Developer — Moyse and White 449 with the omission of metol, 16 minutes agitated development gave a barely perceptible density at the longest exposure given the test strip. Needless to say, such development is worthless. Mixing again, this time including the metol but omitting the hydroquinone, produced a fairly satisfactory developer, one which produced densities which differed but very slightly from those produced by the complete formula. In the case of the second series a similar test was made, the results of which are presented in Fig. 4. Here the borax concen 20 /s J.O OS y Figure 4. Eight minute developments with: Sodium sulfite, 75 g/1; metol, varied; borax, 5 g/l; hydroquinone, varied. Emul. 2568. CiiYve No. Metol Hydroquinone Fog 1 0 20 .07 2 2.5 0 .07 3 2.5 5 .08 4 2.5 10 .10 tration is higher than in the previous case and the hydroquinone alone does develop noticeably, but still not enough to make a worthwhile developer by itself. Metol alone is very satisfactory and the densities differ but little from those produced with an additional 5 or 10 gm. hydroquinone. The tests showed a tendency for fog to increase more than in proportion to the additional development produced by the increase of hydroquinone. The net result was that cleaner, more satisfactory development was obtained by increasing the time some twenty per cent with metol only as a reducer. The degree of increase of fog with hydroquinone differed somewhat between different emulsions, and in many cases was serious.