Servicing projection equipment (1932)

Page scan 000143 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000143
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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STEREOPTICON TROUBLES 127 light beam to its normal path. If the light beam develops any troubles, look for a damage or a shifting of these prisms and if possible, correct, readjust, or replace them. 7. Stereopticon Slides Crack Excessively (a) — If the stereopticon is used as a separate unit, that is, away from the projector, the amperage employed is probably too high for its needs, and overheating results. In this manner the slide has to be kept in the light and the heat so long that it cannot stand the strains imposed upon it. It, therefore, becomes overheated, expands, and then cracks when it is removed and allowed to cool suddenly. The remedy is a reduction of the amperage. (b) — If the slides are being projected on the film projector, the amperage used for the film is probably much more than that which is required for the stereopticon work. Reduce the amperage. (c) — If the slides are piled up in stacks while they are still hot, they will, undoubtedly, crack. For, while they are cooling they are put under the stress of the weight of the slides piled above them. Note: Water jackets, which will eliminate all slide cracking, are now being manufactured for use with the double dissolving stereopticon.