F. H. Richardson's bluebook of projection (1935)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000133
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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LENSES AND MIRRORS 115 streaked effect in the screen image; In such case the lens must be returned to its maker for repair. It is a job that cannot be done by the projectionist without danger of disturbing the lens corrections. I 5(^ ) Some lens manufacturers employ a de sign in which the rear clement ( rear lenses I is the cemented com bination, giving a long lens. The rear element is located much closer to the aperture than is usual in lenses having the front elements cemented. This design locates the cement considerably closer to the point of greatest heat concentration and consequently it is subjected to steady deterioration. Repairing I ,enses (60) If one element of a projection lens is injured, the manufacturer can replace it. Send him the entire f~p/AMBT£R\ I \t-OUTSIPE W J L_ FREE J I | ] P/ A METE A. j | U OUTSIDE J I DlAMETEfiT] Fig. 37. — Sectional view of projection lens elements and their mountings. lens including the broken parts of the element to be repaired. (61) This will enable him to restore the lens to its exact original focal length. (62) Odd lenses taken from old compound lenses have no value. They could be utilized only in building a new lens, but it would cost more than a good stock lens. Ordering Lenses (63) When ordering projection lenses supply the fol data: (a) Kind of light source — Ma/da. lowing