Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000218
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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Fig. 4. Reproducer mounted between projector and upper magazine. and unhooking a spring, and then releasing four corner mountings. Figure 5 is a schematic representation of the base-plate assembly. It shows the path of CinemaScope film through the filter mechanism, over the magnetic head and around the idler rollers. It will be noted that the mechanism is similar to other magnetic film-pulling mechanisms using the Davis drive2 with two impedance drums, except that in this instance the dual-purpose large sprocket is film driven, the film being driven by the upper film sprocket in the picture projector. Since the length of film path from the picture aperture to the top of the housing varies in different makes of projectors, one idlerroller position has been made adjustable and is set at the time of installation to compensate for this variable and to provide the correct separation of 28 frames between picture and sound. The filter-arm assembly is similar to those used on previously designed machines except that in this case the filter rollers are without flanges, the film being guided by flanges on the film sprocket. Threading is aided by holes through two targets on the filter arms which become concentric when the correct length of film is threaded. The Davis and Manley: Multitrack Sound Reproducer 211