Richardson's handbook of projection (1930)

Page scan 000231 from Richardson's handbook of projection

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000231
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:
August 01, 2024
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MANAGERS AND PROJECTIONISTS 1155 RCA Photophone Motor-Generator Equipment. Fig 418 shows two motor-generator units as supplied with the larger installations of RCA Photophone reproducing equipment. The four-unit machines are composed, each, of three generators and a driving motor. — From left to right: 500/1000-volt generator for supplying plate current to all tubes, and polarizing voltage to photo-electric cell; driving motor (for 220volt, 60cycle 3phase operation in A. C. supplied installations, or for 125 volts D. C. operation in D. C. supplied theatres) ; 15volt generator for supplying filament current to all tubes, pilot lights and exciter lamps; 250volt generator for supplying field current to the other generators, bias "C" voltage to the power tubes of the amplifier, and field current to the loudspeakers.