Servicing projection equipment (1932)

Page scan 00068 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00068
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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52 LIGHT SOURCE (Filament Lamps) LIGHT SOURCE Filament Lamps 1. Bulb Looks Blackened (a) — Filament evaporation turns all such bulbs slightly dark, but the construction is such that most of the blackening is above the light diverging range. Therefore, if the lamp gives satisfactory illumination, the blackening can be disregarded. 2. Dark Spot Shows in Filament Coils (a) — This may be due to a short circuit caused by the coils touching each other. No correction, other than the installation of a new lamp, is possible for this trouble. 3. Lamps Have Very Short Life (a) — In an attempt to obtain more screen brilliancy the lamps are overloaded. The rated current of the lamp must not be exceeded. A new or brighter screen surface will help reduce the need for overloading.