Cinematographic annual : 1930 (1930)

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000406
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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386 CINEMATOGRAPHIC ANNUAL before the picture projection lens and the sprocket which must carry the sound record with a uniform motion in front of the photoelectric cell. Special precautions are necessary to prevent vibrations and speed fluctuations, due to either a varying supply PROJECTOR HEAD FILM TENSION PAD GUIDE ROLLER... APERTURE PLATE LENS TUBE EXCITING LAMPSTRIPPER LAMP SOCKET LIGHT GATE FILM PICK-UP AMPLIFIER \PH0T0-ELECTRIC CELL SPROCKET A' GUIDE ROLLER FIGURE 3 voltage or a varying load, from affecting the uniformity of rotation of the sound sprocket. The speed of the driving motor is automatically controlled as described in this paper under the heading Maintaining Synchronism. A mechanical device is also interposed between the sound sprocket and the rest of the moving equipment of the projector so that no abrupt change of speed will be transmitted to the sound sprocket. Fig. U shows the exciting lamp and the lens relative to the film plane. The light from the exciting lamp is focussed on