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 #:
00072
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 71 mately with the line voltage and frequency marked on the name plate on the compensarc. 4th — Be sure that all connections from the line to the lamp terminals are tightened up and see that the switch has not been damaged in shipment. In every case try to get the best results on the given current that you possibly can by focusing the arc in relation to the lens. This can only be determined by trial. If you operate the arc too closely to the condenser lens you are apt to crack it. Do not try to run any more current in the lamp* than necessary for the light required. A %-in. carbon will operate very satisfactorily on 40 amperes, with about a 3/16 in. separation. Very much more current than this will tend to produce noise at the arc. This noise is not caused by the compensarc, but is caused by the alternating current in the arc and will be present no matter wh&t kind of an outfit is used. Flexible Armored Cable. Twin Conductors