Servicing projection equipment (1932)

Page scan 000140 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000140
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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124 STERE0PT1C0N TROUBLES 3. Yellow Corners in Stereopticon Picture (a) — The reasons for this are the same as those listed under section 2, on page 123, headed " 'Ghost' in Center of Stereopticon Picture." 4, Both Pictures of Dissolving Stereopticon Fail to Be in Register (a) — In this case, the lenses may not be perfectly matched. If a new lens has been installed, test the device with the old lens system and correct the fault. (b) — Another reason for this trouble is the fact that the manufacturer may have provided unmatched lenses. To test this, project a standard slide from one of the lenses (top lens), and mark, exactly, the limits of the picture on the screen. Then superimpose upon this marked space the same slide projected by the other lens (lower lens). If the picture thus projected from the lower lens does not match the marked space, do the following : remove the lower lens from the lower element of the stereopticon and substitute the upper lens in its place. Then re-project the same slide from the lower element. If the picture, thus projected, is superimposed exactly within the marked space, it means that the lower lens, which was removed, was not matched perfectly by the manufacturer and should therefore be changed. This test should be applied