Motion picture projection : an elementary text book (1928)

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
000709
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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MOTION PICTURE PROJECTION 703 read backward, the trouble must be corrected. See that all connections are made as indicated on the diagram. The polarity must come correct if the connections are made in accordance with the diagram of connections, and the armature of the set rotates in the direction marked on the coupling. STARTING THE SECOND LAMP To start the second lamp, bring the carbons together to close the circuits ; close the lamp switch and open the short-circuiting switch. This puts the two lamps in series, the current from the first lamp flowing through the second lamp. The arc at the second lamp is adjusted in the regular manner while both lamps are burning. When ready to change over from one lamp to the other, bring the carbons of the first lamp together and close its short-circuiting switch, continuing the projection on the second lamp. It has been found in practice that the following scheme gives the most satisfactory results. A minute or two before the end of a reel of film is reached bring the carbons of the second lamp together, close its line switch and open its shortcircuiting switch. The current for the first lamp flowing through the carbons of the second lamp causes the tips of the carbons of the second lamp to heat up to a white heat without actually drawing an arc. Since the tips of the carbons are heated up by this method a normal arc is easily and quickly secured when it is time to change over to the second lamp.