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 #:
000123
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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122 MOTION PICTURE PROJECTION LENSES The optical system of a moving picture circuit comprises : (a) The arc lamp or mazda lamp. (6) The condensers. (c) The lens, or objective. The optical system is a very important one and one that has long been neglected by the majority of operators. A number of men who have been operating machines for years have never taken the lenses apart and have no idea of the different combinations making up the objective lens. There is no motion picture book published that we know of which goes far enough into this matter, and we would advise anyone desirous of getting all the information possible on lenses to study the books dealing with this subject that may be found in the various libraries. The following is an outline of what an operator should know, and has been gathered from several books dealing with optical systems and lenses. Reflection. The change of direction experienced by a ray of light when it strikes a surface and is thrown back or reflected. Light is reflected according to two laws : (a) The angle of reflection is equal to the angle of incidence. (6) The incident and the reflected rays are both in the same plane which is perpendicular to the reflecting surface.