Servicing projection equipment (1932)

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000132
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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116 LIGHT CONDITIONS 15. Light Shows Outside Screen Area (a) — This may be due to the fact that the black coating on the inside of the lens barrel has worn, cracked, or flaked off and is therefore refracting the light. The inside of the barrel should be re-coated with dead black and should be inspected occasionally. 16. Light Loses Brilliancy (a) — Dirt or corrosion may have decreased the current passage to the carbons. Inspect the carbon contacts. If a reflector arc is employed, note if the carbon, which is not straight, has changed the position of the arc crater. If a high intensity is employed, note if the carbon is making a poor contact, either at the end, at the carbon rest, or wherever the current passes into the carbon. If an incandescent lamp is employed, note whether the filaments are sagging or are short-circuited. 17. Picture Less Brilliant at Some Points in Audi' torium Than in Others (a) — In this case the screen may have deteriorated and may have lost its reflecting surface or diffusing power. The only remedy for this is a re-surfacing of the screen or the installation of a new screen.