Richardson's handbook of projection (1930)

Page scan 000226 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 #:
000226
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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1150 HANDBOOK OF PROJECTION FOR case of an emergency it may be placed in service in a very short time. The power supply for the 4-unit motor-generator sets may be either 110 volts D. C. or 220 volts, three-phase alternating current. Each of these MG sets is provided with approved fused line switches, and with automatic starters, remote controlled from the amplifier racks. The Type "B" (MG) equipment consists of two RCA Photophone projectors, or two professional projectors equipped with RCA Photophone sound attachments. One amplifier rack, one 4-unit motor-generator set, two storage batteries, twelve RCA Photophone electrodynamic 12-inch cone loud-speakers, and all necessary installation and operating accessories. The amplifier used in this equipment consists of one voltage amplifier and two power amplifiers. Normally the two power amplifiers are used, each amplifier operating six of the 12-inch dynamic cone speakers. The power amplifiers are so arranged that in case one fails, the show can proceed with one amplifier. The 4-unit motor-generator set used with the Type "B" amplifier is similar to the one used in the Type "A" equipment. The Types "A" and "B" equipments are similar in construction and operation. The Type "A" equipment has duplicate amplifier racks and affords a complete standby equipment, whereas the Type "B" equipment has one rack and two power amplifiers, and in case of emergency this equipment may be operated with only one of the power amplifiers. It is to be noted that all power for the "A" and "B" (MG) amplifier is supplied by motor-generator sets, which eliminates the necessity for batteries. The two