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 #:
00051
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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50 MOTION PICTURE PROJECTION creased the percentage wasted is proportionately much greater. Rheostats should be installed outside the projection room wherever possible, preferably on a shelf near the ceiling and located near enough to the vent to allow the heat from the rheostat to be carried to the open air. They should be kept away from anything inflammable. Where the rheostat is located away from the projector it is advisable to have a control switch so placed that the operator can cut Separate Unit of Robin Multiple Unit Rheostat in or out resistance without having to leave his machine. All electric connections should be kept tight to prevent arcing; remember copper oxodizes under excessive heat and additional resistance is thus added to the circuit. MULTIPLE UNIT RHEOSTATS A multiple rheostat consists of several independent rheostats arranged in a housing; each unit is a separate arc rheostat, delivering two and one