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 #:
00014
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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July, 1939] MOTION PICTURE FILM AND TELEVISION 9 Fig. 3 shows a projection sequence by which an intermittent type projector might project film on an Iconoscope for the entire scanning time provided the pull-down occurred in the almost prohibitively short time of l/m second or less. This would permit projection throughout the entire scanning period. There is no apparatus now available for meeting the Veoo second pull-down requirement. If suitable equipment could be developed it is doubtful whether the film would withstand the stresses imposed by the rapid motion. FIG. 6. Film projector, with doors open. An experimental projector using a continuously moving film, and a rocking mirror for producing a stationary image, was built and tested. A diagrammatic view of it is shown in Fig. 4. The cam-driven mirror was arranged to neutralize accurately the film motion during the intervals marked "light flash" in Fig. 3 and to return to receive light from the next consecutive film frame during the Yew-second non_ uniformly spaced intervals marked "pull-down." Limitations were found due to slight non-uniform illumination of the approximately two and one-half frames of film always in the picture gate. This resulted in objectionable flicker in the television picture. Also, in spite of the very small amplitude of motion required for the rocking