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

Page scan 000507 from Journal of the Society of Motion Picture Engineers

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 #:
000507
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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494 CHANDLER, LYMAN, AND MARTIN Vol 48, No. 6 DRIVE SPROCKET XTERNAL TENSION ON FILM IN OUNCES H w ORETICALLY UNSATISFACTORY ZONE Film Longer than Sprocket THEORETICALLY SATISFACTORY ZONE Film Shorter than Sprocket L E ] D « S J s r s E E D s s s s E D s s s ; s I S ! s s s s s >l.6 +1.4 +1.2 -<X2 -0,4 -06 -Ofl -1.0 -12 -1.4 -I DIFFERENCE BETWEEN PITCH OF FILM AND PITCH OF SPROCKET IN PER CENT / = Slight interference at entering S = Satisfactory. tooth. D = Distortion near point of E = Extreme interference at enter contact, ing tooth. HOLDBACK SPROCKET THEORETICALLY SATISFACTORY ZONE Film Longer than Sprocket STERNAL TENSION ON FILM IN OUNCES V c s s r f V s s f F p F V s s F f F P I \ s s < S 1 F s s THEORETICALLY UNSATISFACTORY ZONE Film Shorter than Sprocket +0.6 +0.4 +02 0 -0.2 -0.4 -0.6 -OB DIFFERENCE BETWEEN PITCH OF FILM AND PITCH OF SPROCKET IN PER CENT 6" = Satisfactory. / = Slight interference at enter V = Slight vibration of film at leav ing tooth. ing tooth — may be due to F = Failure — film leaves large amount of forward slip. sprocket and loop is lost. FIG. 5.