Servicing projection equipment (1932)

Page scan 00062 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00062
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
Date Added:
May 15, 2025
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46 LIGHT SOURCE (Carbon Troubles) LIGHT SOURCE Carbon Troubles General Trouble with Oldstyle Arcs 1. Crater "Wanders" About (a) — This may be due to the fact that the wrong type of carbon is being used. If a solid upper carbon is used, it has no core with which to make an easy path for the current to pass through and with which to hold the current to one path. If solid positives are being employed, change to cored positives. (b) — The negative carbon may, probably, be too large for the positive. If a large negative, that holds a blunt point, is employed because it is cheaper, try a smaller metal coated negative and be sure the carbons are set in proper alignment. The lower carbon must not be centered directly underneath the positive, but slightly in advance of it to form a crater at a suitable angle. 2. Carbons Have Very Short Life (a) — Carbons are being employed which are