Servicing projection equipment (1932)

Page scan 000124 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000124
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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108 LIGHT CONDITIONS detail even though the print shows good detail. The only remedy in such a case is to obtain a new screen surface. (c) — Dust has been allowed to settle on the screen until it has become coated and no longer gives a sharp, accurate reflecting surface. The screen should be cleaned or re-surfaced. 4. Dirty, Smoky, Smudgy Light Effect on Screen (a) — This may be due to the use of a low voltage which compels the carbons to be so close together that the arc is not held at a proper point and therefore wanders. Increase the voltage slightly and note if the effect improves. (b) — The motor generator may not be delivering the voltage it is supposed to be delivering. Check the voltage at the generator with an accurate voltmeter, and if the trouble is found here look under section headed, Motors and Motor Generators. 5. Light Seems to Get Bright and Fade Away With A.C. Arc (a) — Due to the fact that A.C. cycles have points of full voltage and of no voltage, they give off an effect, similar to that of a shutter, of vivid lighting and of cutting off the light. Although this is not noticeable at the ordinary frequency because