Servicing projection equipment (1932)

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000155
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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RHEOSTAT 139 (c) — Heavily corroded contacts may occasionally arrest the flow of the current or reduce noticeably. Inspect the contacts and clean or tighten them. (d) — There may be a broken or loose connection or a serious ground within the device. Inspect the device, and if the connections are secure, test it for a ground. Then test for broken down or damaged insulation at the points where the coils or the grids are joined. Finally, see if any grid or coil is contacting with the frame. Note: If ordinary testing fails to show the ground, and no other cause is apparent, test as follows: Take the rheostat out of the circuit. Use a test lamp connected in a regular incandescent light socket. Put lamp in circuit and with free end of wire touch the other binding post. If lamp lights, there is no break or burned-out coil, and the circuit is complete. If lamp lights and goes out intermittently, there is bad contact somewhere within the device. Taking each coil or grid as a unit, disconnect it at the lower end from device — such as, coil one, disconnect lower end, touch lower (free), end with wire. A light or a ring shows that it is intact. Keconnect, then disconnect second coil and so proceed, disconnecting lower end of next one as soon as one tests correctly and is reconnected. When you come to one that gives an intermittent light, you