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

Page scan 000466 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 #:
000466
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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450 Transactions of SM.P.E., Vol. XIII, No. 38, 1929 With metol alone as a reducer, the image density for fixed time of development does not increase indefinitely. Fig. 5 shows a series of curves with increasing metol concentration. It is to be noted that the alkalinity of the developer, pH, decreases due to the addition of the metol, which is sold commercially as a sulfate and hydrolyzes liberating acid in the developer, making the solution less alkaline. Figure 5. Eight minute developments with: Sodium sulfiite, 75 g/lj metol, varied; borax, 5 g/1. Emul. 2568. Curve No. Metol pH Fog 1 2.5 9.0 .07 2 5 8.6 .05 3 10 8.2 .07 The activity is thus so reduced that 10 g/1. of metol gives less development than 5 g/1. The increased concentration can be made more effective by progressively increasing the borax content as the metol is added, if that increased activity is desired. A balance of 5 g/1. borax and 2.5 g/1. metol together with 75 g/1. of sulfite gives a developer which very closely approximates the development rate of other borax formulas in use, and at the same time makes economical use of the expensive reducing agent. Potassium Bromide The fog produced by this' developer is sufficiently low so that no bromide is needed as a restrainer. The retarding effect of bromide is shown in Fig. 6. Even with small quantities there is a marked loss of effective emulsion speed.