Servicing projection equipment (1932)

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000125
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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LIGHT CONDITIONS 109 of persistence-of -vision, any decrease in the number of cycles per second will cause an effect of lowered light intensity on the screen — that is, provided that the decrease in the number of cycles per second brings the no-voltage period into synchronization with the period when the shutter is open. As the synchronization, due to the shutter speed and its coincidence with the cycle changes, comes closer to completeness, or falls away, the light will seem to increase or to decrease in brilliancy. This fading up and down will occur sometimes in slow cycles, sometimes intermittently, and sometimes only for a short period. If this fading is persistent, try changing the speed of the projector, for it may serve to rectify this trouble provided the change in the cycle alternations is only temporary. If this condition is prevalent and a two-wing shutter is being employed, adjust it to a synchronous speed. 6, Light on Screen Poor With Incandescent Lamp (a) — TVhen changing to incandescent as a light source, if the illumination is poorer than that of the former light source, it is to be remembered that the light is softer and less vivid than that of a "hard" type of arc light. In this case you may be discrediting the "soft" light. Before reaching a definite conclusion, it is advisable to try the "soft" light for a while.