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 #:
000425
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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REPRODUCTION FN THE THEATRE 405 trouble. For disc reproduction, a transfer switch is connected so that the photoelectric cell transformer is replaced by a magnetic pickup. This entire assembly is driven by a motor which will give constant 90 feet per minute film speed or 33 J/^ r.p.m. record speed independent of varying line voltages and condition of load within operating limits and satisfies the requirement of reproduction that the film must pass the reproducing light beam at a constant velocity, that being the condition of film travel when the sound was photographed upon it. The voltage amplifier consists of three stages push-pull UX 210 amplification which are battery operated. The voltage amplifier feeds an A.C. operated power amplifier capable of delivering 10 watts undistorted power. Its push-pull output consists of 2 UX 250 tubes. Such a power amplifier feeds four dynamic cones. Each power amplifier also has a rectox unit for supplying direct current to the fields of the cones connected to it, eliminating the use of horn batteries. For larger theatres, similar power units are paralleled, all being connected to the same voltage amplifier. p On such larger installations, the Rear view of rca Photophone voltage amplifier is duplicated Type C amplifier. The top two am -p *, • ,., , for emergency use and is readily placed in service by throwing a the lower two power.