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 #:
00088
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 87 from open circuits you should get a ring, next connect the terminals of bell set between one of the coils or plates in rheostat and the iron frame, if you get a ring it signifies that the rheostat is grounded, but this test will not tell you which coil or plate is causing the ground. To find exactly where ground is, proceed as follows : connect bell set between the first coil and frame, if you get a ring, disconnect the first coil, now connect between the second coil and frame, if you get a ring disconnect the second coil, and do the same to third and fourth coil, keep testing in this manner till bell stops ringing, then the coil you removed last was the coil that was grounded, so if you have removed six coils and the bell stops ringing when connected between the seventh coil and frame, it was coil number six that was grounded. If the rheostat is made of more than one section, test each section separately and find which section the ground is in, then proceed as above. This is to save time.