Servicing projection equipment (1932)

Page scan 00064 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00064
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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48 LIGHT SOURCE (Carbon Troubles) Inspect this first, and note if the rest is clean and free from corrosion and resistance-making dirt. Note also if the springs and the weight holding the carbon in contact with the rest, work properly. If not, correct them. 5. Carbon Needles, Spindles, and Pencils (a) — This may be due to the use of too small a positive, which induces a quick consumption of the materials, a possible blown out core, or a burning away of the tip into the forms mentioned in the heading. Change the size of the carbon. (b) — According to the style of the lamp employed, the following may be the causes of this trouble: — a poor contact between the carbon and the holder, a poor contact between the carbon and the clamp, or a poor contact between the carbon and the contact shoes. The heat thus induced adds to the carbon heat and tends to burn away the materials very quickly. (c) — In a negative carbon this trouble is due to the fact that the carbon is too small for the current employed; or, as with the reduction of the crater mentioned above, in the H.I. type lamp it is due to poor care of the rest through which part of the current is fed into the carbon. Dirt or an improper contact will also compel the carbon to carry the current through its whole length, heat up, and