Transactions of the Society of Motion Picture Engineers (1929)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1929
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1929)
Leaf #:
000159
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:
November 17, 2022
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The Camera in Sound Pictures — Howell and Duhraij 149 sion. As shown in figure 6, the side tension is applied on both curved sections of the channel. The side pressure of the floating rail is uniformly distributed along the entire curved sections of the film channel. Mr. Richardson : I should suppose that there would be a tendency to scratch the film by reason of dust particles in the air. Mr. Dubray : The danger of scratches is so minimized in this movement that it can be considered as eliminated. The absence of pressure against the face of the film, the hardness and polish of the steel plates, and the fact that the movement is enclosed in an air tight casing, which prevents dirt penetrating into it, reduce the danger of scratches to a very minimum. The resistance of the side tension against the feed fingers causes the film to run against the aperture plate. Normal care in keeping the movement clean, which is made very easy through the facility with which the aperture plate can be removed, further insures the minimizing of the ' ' scratch evil. ' ' Mr. Ross : Does the position of the belt tightener require more power being used ? Mr. Dubray: I cannot answer this question with engineering accuracy, but I am sure that if any more power is needed, this is negligible, especially if compared with the power necessary to take up a 1000' roll of film. The power of the synchronized driving motors in general use is amply sufficient to take care of that.