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 #:
00054
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 53 NEW DEVICE FOR CONTROLLING RESISTANCE A patent has just been granted for an electrical regulating switch for limiting the current in two separate circuits to a predetermined maximum. The invention relates to a new or improved regulating switch and is particularly adapted for use in connection with motion-picture projectors, especially in cases where two or more machines are used. The <5 object of the invention consists in a new or improved arrangement whereby the amount of current switched on in either one or two arcs, is limited to a predetermined maximum. According to the inventor the switch arms for each set of resistances are arranged to move over the usual radially arranged contact studs, preferably disposed side by side or one above the other.