Society of Motion Picture Engineers : incorporation and by-laws (1924)

Page scan 000112 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1924
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1924)
Leaf #:
000112
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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104 Transactions of S.M.P.E., May 192J^ Co7iclusion The general conclusion from this work is that the idea sometimes expressed that the mechanical strength of such materials as celluloid and similar plastics is greatly dependent upon superficial scratches and a surface skin does not hold for motion picture support. It appears from this that the principal effect of the scratch is due to its depth affecting the thickness of support at a given point and consequently reducing the effective thickness. Characteristic effects are shown in regard to the position of a scratch in the neighborhood of perforations which are such as would be expected, but practically all the scratches which were operative in the present work were well beyond the depth and intensity of scratches appearing on motion picture film support. Rochester, N. Y. May 10, 1924. FILM STRETCH TEST BREAKING LOAD £=PERMANANT ELONGATION \ TOTAL ELONQATION REVERSIBU ELOHQATIOK LOAD IN KSMS Fig. 1. Table 1 '^oad in qms. on Breaking Load No. Folds on Scratch Tester on Film Tester Folding Tester 0 11.0 Kg. 325 200 10.0 325 250 9.5 320 320 9.8 267 390 8.65 248 470 8.5 245 560 7.5 245 670 7.5 200 780 7.5 190 930 6.3 150-108 1080 4.8 76-100 1270 1.6-3.2 46-60 Fig. 2.