Servicing projection equipment (1932)

Page scan 00073 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00073
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 15, 2024
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MERCURY ARC RECTIFIER 57 MERCURY ARC RECTIFIER 1. Rectifier Does Not Work On Starting-Up (a) — The fuses, which should be tested first, may be blown out. Replace them, if necessary. (b) — The supply line voltage may be off. Test for current at the rectifier tube, and if none is found there, test for current on the line side of the switch. Be sure that all the switches in the circuit are closed. (c) — The circuit may be open. If the fuses are intact, the switches are closed, and the line voltage is correct, note if all the contacts are tight. Note especially if the electrodes of the tube make the proper contacts. (d) — The tube may be dead. Examine it, and if the tube is badly blackened, it is probably shortcircuited between starting anode and cathode. Try a spare tube. Note: The mercury in the tube should produce a sharp, crackling sound when it is allowed to roll about gently in the tube. If a dull sound is heard, it is best to put this tube aside and use another.