16-mm sound motion pictures, a manual for the professional and the amateur (1949-55)

Record Details:

Title:
16-mm sound motion pictures, a manual for the professional and the amateur
Date:
1949-55
Publisher:
New York : Interscience Publishers, Inc.
Volume:
16-mm sound motion pictures : a manual for the professional and the amateur
Leaf #:
000479
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
July 18, 2024
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THE PRO.JKCTOR 461 reel upon which the unused portion of the film is carried. "B" is the feed sprocket which rotates at constant speed while pulling film from the supply reel and also maintains a free loop of film just ahead of the picture gate "C". At the picture gate the film is held in proper position for projection; within the film gate is the projector aperture through which light passes on its way to the screen via "D" the projection objective lens after passing through the picture image of the film. The film leaves the picture gate below the movement claw located near the aperture, and another free loop is formed before the film enters tie Fig. 108. Typical 16-mm sound projector (Ampro). transport system of the sound translating portion of the machine. Part way through the sound transport system, the sound track on the film intercepts the sound light beam at "E". The modulated light beam is directed to the surface of a photoelectric cell for the translation of light variations into electrical currents and for subsequent amplification and translation into sound by a loudspeaker. "F" is the takeup sprocket which rotates at constant speed just as the feed sprocket does, and pulls the film through the sound transport system. "G" is the takeup reel on which the film is wound after it has passed through the machine. A 750-w. incandescent lamp is the customary light source for picture pro