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 #:
000122
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 121 At E is an electric arc or other suitable illuminant, the light from which is caught up by the condenser C. This condenser is an arrangement of lenses so constructed as to gather up the greatest volume of light possible and to concentrate the light which it gathers at the center or diaphragm plane of the objective when the objective is located at the proper distance from the film, which distance is determined by the focal length of objective lens. The film should be placed at such a point that the entire area of the aperture in gate is fully illuminated, and it should also be placed so that the greatest number of light rays possible should pass through it. Proceeding from the slide D or film F the light passes through the objective 0, where the rays cross, and the object is therefore reversed, by means of the objective, the object is also imaged or delineated upon the screen S, the degree of sharpness or flatness of the image depends upon the optical connection of the lens. Great care should be taken to line up properly the arc, condensers and the objective lens, as under the best of conditions less than 5% of the light from arc reaches the screen.