Servicing projection equipment (1932)

Page scan 00037 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00037
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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FUSES 21 any other kind ; throw them away at once and avoid the danger of getting them mixed. 4. Fuses Blow Out When Arc Is Struck (Where 3-Wire System is in Use) (a) — The carbon arm of the projector, if connected to the neutral wire of a 3-wire system, will become grounded. It also may be cutting out the rheostat resistance, thus overloading the fuse, when in striking the arc, a heavy current flows. If the resistance of the carbons and the ground combined is less than that formerly in the circuit on the rheostat, the fuse will blow out every time the arc is struck. Locate the ground and remove the cause. In cases where the lamphouse is permanently grounded, see if the carbon jaws are also grounded to the lamphouse. This grounding of the carbon jaws may be due either to carbon dust or to a\ broken strand in the contact or lead to the carbon jaws. If the trouble is not found at the lamphouse, look for a heavy ground elsewhere and eliminate it. 5. Fuse Locating; Easy Way to Locate Quickly in Emergency (a) — Make a master list of all the panels, with a list under each panel heading of the circuits and their fuses. Number the fuses in each panel and place these numbers against the same circuits on