Servicing projection equipment (1932)

Page scan 00065 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00065
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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LIGHT SOURCE (Carbon Troubles) 49 finally, to pencil. Check up and remedy these faults. Some projectionists clean the H.I. type lamp contact after every few reels, especially that type which has a "V" rest. If the negative metal coating is too thin, it will also cause needling. 6, Carbon Shattered by Striking Arc (a) — This may be due to the fact that the carbons are not separated quickly enough when striking the arc. This must be done instantaneously or else the carbons may have their points "graphited" or shattered. (b) — Striking the carbons together too hard is another common cause for this trouble. 7, Carbon Develops Mushroom (Button), Point Also Known as "Freezing of Arc" (a) — Too short an arc is being maintained. The changing of the carbons will not help, but the increasing of the arc length slightly will remedy this trouble. 8, Carbon Core Burns Away, Recesses (a) — Current is too low for the size of the positive in use. Increase the current slightly and see if the condition does not improve; or use a smaller carbon if the current is limited to the value in use.