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 #:
000302
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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March, 1930] SURFACE TREATMENT OF SOUND 285 to a high gloss, and then coating a solution of paraffin on the edges for lubrication. Sample No. 95 which was simply buffed and then edge-waxed with a paraffin solution is the next in order of choice. This sample was cleaned and retreated after every ten runs. As a third choice, No. 101, which was merely bathed on the cleaning machine in a solution of carbon tetrachloride containing 0.25 per 1C 20 30 40 50 60 70 80 90 100 110 120 130 SO 90 100 IK) HO 130 FIG. 3. Curves showing change in relative ground noise volume level with continued projection. cent of cantol wax when new and cleaned in the same solution after every ten projector runs, offers a moderate degree of protection without requiring the use of a polishing machine in the first treatment or in the after treatments. A slight degree of protection was effected by the treatments indicated in Table VI. It is noteworthy that with the edge lubrication treatment (Nos. 96 and 97) there was a definitely lower rate of ground noise accumulation than with an untreated film (No. 103). No protection whatever could be noticed in the case of sample