Servicing projection equipment (1932)

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000156
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:
March 28, 2024
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140 RHEOSTAT have located the trouble. If when it is disconnected at one end there is no failure of the lamp, then there has been a contact with the frame when it was connected into the circuit, or else there has been a contact with another coil or grid. Make sure by connecting one wire of tester to the frame and the other to a wire of opposite polarity: — if the lamp then lights, there is surely a ground to the frame. With a lead from arc to rheostat disconnected, and a lead from line to rheostat still connected, with one lead of test lamp attached to the rheostat frame and the other to wire of opposite polarity, then disconnect, one after the other, coils or grids from the frame : the one which extinguishes the lamp is the troublesome one and can be eliminated.