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 #:
00068
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 67 INSTRUCTIONS FOR INSTALLING AND OPERATING A-C. TYPE "A" COMPENSARC The compensarc is a self-contained device and requires no auxiliary rheostat or other controlling mechanism. It should be mounted near the picture machine, so that the switch is convenient to the operator. Before installing the compensarc examine the name plate to see if the rating agrees with the cycles and line voltage of the circuit from which it will operate. Connect both wires from the operating circuit to the two terminals marked "line," and from the two terminals marked "lamp" connect the wires leading to the terminals of the picture machine lamp. As this is an alternating-current device, there are no positive or negative wires. The primary or line wires should be fused with a fuse about half the size of the maximum current at the lamp. This would ordinarily require about 30ampere fuse. This device is adjustable in three steps, which three steps have been found to meet the general service conditions. When the switch is open no current flows through the lamp, so the operator can freely take out the carbons and make any adjustments required without opening the line switch. Throwing the switch blade in contact with clip No. 1 gives an adjustment so that with the carbons separated about 3/16 in. the current supply is ap