Motion picture projection; an elementary text-book (1921)

Record Details:

Title:
Motion picture projection; an elementary text-book
Date:
1921
Publisher:
New York, Theatre Supply Co.
Volume:
Motion picture projection; an elementary text-book
Leaf #:
000128
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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MOTION PICTURE PROJECTION 127 The first three are thicker at the center than at the border, and are called converging; the second three which are thinner at the center are called diverging. B Fig. 9 The Gundlach-Manhattan Optical Co., makers of the Gundlach Projection Lens, issue the following data regarding Lenses. The Manufacture of lenses presents many difficult problems for the optician to contend with because of the peculiar characteristics of optical glass as well as the fact that it is not a material easily worked owing to its hard, brittle nature. To produce lenses that are well corrected in the optical sense and maintain a uniform standard of' quality requires not only scientific knowledge of optics and mathematics of a high order to compute the formula but also the utmost skill and precision must be used during the mechanical operations to obtain the desired result. Even then it depends upon a master optician for the final adjusting and testing before the lens is ready for market because a good lens may be spoiled by improper mounting. In this respect lenses are different from articles made of other materials which