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 #:
00071
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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70 MOTION PICTURE PROJECTION outfit can be installed in the operating room, whereas it would be impossible to do the same with the rheostat. If you think the compensarc is heating up, do not attempt to determine the temperature with your hand, but put a thermometer on it on the hottest part for about five or ten minutes, and then take a reading of the thermometer. Temperature rise should never exceed 40 deg. C. or 72 deg. F. If you will observe some of the following points, you will be pretty sure to get good results : 1st — Make sure that the two leads marked "lamp" are connected directly to the lamp of the picture machine. It is not necessary to select for positive or negative leads. 2nd — The other two cables coming from the compensarc should be connected to the line direct. 3rd — Never connect any resistances up with the compensarc on either the lamp or the line side. The compensarc is intended to cut out all resistances. Be sure the line voltage and frequency agree approxi TbFuse Block and Line, SWITCH Compensarc-^ r/c Lc 1 U' C I' imp — x Line Lamp 99 99 1 Fig. 8. Diagram of Connections for A-C. Compensarc