Servicing projection equipment (1932)

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000153
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 137 lire end of the last good coil, or grid, ahead of the damaged one, over the damaged one, and on to the end of the next good coil, or grid, with which it formerly had a contact. It is best to cut the damaged coil, or grid, out of the circuit and to remove it entirely in order to prevent the possibility of its being sagged or bent. For, if it is sagged or bent it will ground the bridge to the frame. 3. Rheostat Shows Visible Heating at One Point of Coil or Grid (a) — The coils may have sagged together, or, the grid (infrequent), may have bent so that it touches the adjoining member or makes a partial contact with the frame. If it is impossible to correct the sag of the coil, or the bend of the grid, they should be removed and replaced. A temporary repair can often be made, provided the coil or the grid has not burned-out, by putting some powerful insulating material, such as asbestos sheeting of good thickness, between the contacting coils, the contacting coil and the frame, or the contacting grid and the frame, as the case may require. 4. Rheostat Overheats and Does Not Operate Properly (a) — Perhaps it is being overloaded, that is, it is working on a voltage which is higher than that of its rated capacity. In this case it is necessary to add