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 #:
000462
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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446 Transactions of S.M.P.E., Vol XIII, No. 38, 1929 all aided in showing the relationships among them and the developing effects of the constituents. Table 1 gives the two basic formulas and also indicates the range of concentrations tested. Results Sulfite It was found that an increased rate of development accompanied increases in sulfite content up to a rather definite maximum, beyond which additional sulfite caused a falling off in high densities and in many cases a distinct loss in effective emulsion speed. Fig. 1 shows curves for one time of development in developers differing only in sulfite content. Figure 1. Eight minute developments with: Sodium sulfite, varied; metol; 2 g/1. hydroquinone, 5 g/1; borax, 2, g/1. Emul. No. 1612. Curve No. Sulfite Fog 1 1 (approx) .01 2 10 .06 3 50 .13 4 100 .14 The increasing development occasioned by increase of sulfite concentration from the initial low value is apparently due to the increased alkalinity produced by the larger quantities of sulfite. The alkalinity increases to a limiting value such that further sulfite additions leave it unchanged. An increasing solvent action also accompanies increase of sulfite concentration. This solvent action has been known for many years and C. E. K. Mees and C. W. Piper i)ublished data on the quantities