Principles of cinematography : a handbook of motion picture technology (1953)

Page scan 000395 from Principles of cinematography : a handbook of motion picture technology

Record Details:

Title:
Principles of cinematography : a handbook of motion picture technology
Date:
1953
Publisher:
London : Fountain Press
Volume:
Principles of cinematography : a handbook of motion picture technology
Leaf #:
000395
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Date Added:
May 15, 2025
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16-MM SOUND-FILM PROJECTION 391 motion at the sound scanning point. Firstly, the film may be pulled over a stationary gate, in which it is accurately located by edge guides, and at which the scanning takes place. Secondly, by so designing a rotating drum that the sound track may be scanned at a point on the drum surface. The first of these designs is shown in principle in diagram 'A', Figure 167. In this arrangement the film is moved intermittently through the picture gate and is then formed in a relatively large free loop until it is constrained by spring loaded edge guides to pass over the curved surface of a stationary scanning gate. It is at this point that the sound reproduction commences. The film is pulled through the gate by means of a constant speed drum contact between the drum and the film is over such a large area that sufficient power is imparted to the film to overcome the friction in the scanning gate. The film then passes over the usual take-up sprocket and so to the take-up spool. When the projector commences to operate the film between the drum and the take-up sprocket is pulled taut by the sprocket and the drum is thereby caused to rotate. This drum is mounted in very free bearings and is attached to a shaft which also carries a heavy flywheel. As the machine gathers speed the flywheel will FILM GATE PICTURE PROJECTION CONSTANT SPEED DHUM PICTURE GATE TAKE-UP SPROCKET FILM SCANNED AT THIS POINT ROTARY SOUND SCANNING DRUM SCANNING DRUM SCANNING POINT SCANNING DRUM WORM DRIVE Fig. 167. — Sound film transport at the scanning point. lJ _ WORM —J WHEEL VISCOUS OIL COUPLE