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 #:
000673
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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670 LEVENSON December The spray cabinet and the reservoir were so constructed that air could not penetrate freely in and out, save at the orifices provided for the film to enter and leave. These holes were about 5X1 centimeters in size and, when desired, they could be sealed by means of adhesive tape. No attempt was made to make the cabinet completely airtight. These conditions were chosen because, while complete airtightness would be troublesome to maintain in practice, it would not be inconvenient to prevent the free access of air, and one of the objects of this work was to study the changes in the enclosed air and to Fig. 3 — View of three of the spray tubes showing the disposition of the bluebacked leader film. find whether the use of nitrogen gas would be necessary in order to reduce the rate of oxidation of the developing agents. After making trial runs, it became obvious that the steps taken to prevent the free entry of air were being nullified because the turbulentdeveloper, falling down the return pipe from the cabinet to the reservoir, carried with it a large volume of air which was, of course, replaced by air leaking into the cabinet. To avoid this defect, a wide return pipe was provided for the air to return from the reservoir to the cabinet. In the description given below of the experiments on the composition of the enclosed air, this device will be referred to as the "air-return pipe."