Motion picture projection; an elementary text-book (1921)

Record Details:

Title:
Motion picture projection; an elementary text-book
Date:
1921
Publisher:
New York, Theatre Supply Co.
Volume:
Motion picture projection; an elementary text-book
Leaf #:
000144
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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MOTION PICTURE PROJECTION 148 ROBIN CINEMA ELECTRIC TIME SYSTEM This system, invented by J. E. Robin in 1914, is what the name implies, a system to provide an accurate and predetermined running schedule for motion picture and synchronizing the music with same. It is an electrical speed indicating device, consisting of a small extremely accurate direct current generator attached to the projection machines and connected to a very sensitive meter by cable. The meter is calibrated with the generator and shows in feet per minute and the rate of time per thousand feet at which the film is being operated. In operation the voltage generated varies with the speed of the machine causing a corresponding increase or decrease of the connected meters. Plate No. 1 shows a single unit consisting of a generator, meter and cable for a single machine. PLATE 1 Generator and Meter, Single Unit