Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000693
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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676 J. I. CRABTREE AND H. D. RUSSELL [J. S. M. p. E. Formula II Hypo 300 grams 125 Ibs. Sodium sulfite (desiccated) 17.5 grams 7 Ibs. 5 oz. Potassium chrome alum 32.0 grams 13 Ibs. 4 oz. Sulfuric acid (concentrated) 2 cc. 123/4 oz. Water to make 1 liter 50 gals. It is not desirable to prepare a stock hardener consisting of the sulfite, alum, and sulfuric acid because this would lose its hardening properties on keeping. Practical exhaustion tests were made with the above formulas to determine their behavior on exhaustion with motion picture film developed in the D-16 and D-76 developers, the processing being conducted both at 70°F. and 85°F. (1) Effect of Addition of Developer on Hardening Properties. — Since the loss of hardening properties of a chrome alum fixing bath with immediate use is a result of the addition of developer, increasing quantities of D-16* and D-76** developers were added to definite quantities of fixing bath No. I stored in bottles at 70°F. and 110°F., and the hardening properties of these solutions determined at daily intervals as follows: Strips of Eastman motion picture positive film were developed for five minutes in D-16 developer, then placed directly in the fixing * Formula D-16 Metric Avoirdupois Elon 0.3 gram 2 oz. Sodium sulfite (desiccated) 40.0 grams 16V2 Ibs. Hydroquinone 6.0 grams 2Va Ibs. Sodium carbonate (desiccated) 19 . 0 grams 73/4 Ibs. Potassium bromide 0 . 9 gram 53/4 OZ. Citric acid 0 . 7 gram 4V« oz. Potassium metabisulfite 1 . 5 grams 10 oz. Water to make 1.0 liter 50 gals. Average time of development: 5 to 10 minutes at 65 °K. (18 °C.) ** Formula D-76 Metric Avoirdupois Elon 2 grams 13 oz. Sodium sulfite (desiccated) 100 grams 42 Ibs. Hydroquinone 5 grams 2 Ibs. Borax 2 grams 13 oz. Water to make 1 liter 50 gals. Average time of development: 12 to 25 minutes at 65 °F. (18 °C.)