Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000179
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 01, 2024
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MANAGERS AND PROJECTIONISTS 1103 The condenser, the slit and the objective lens are all contained in a dust-tight metallic tube, or "barrel," which unit is commonly referred to as the "slit assembly." This assembly is located with great precision at the laboratory, a microscope being used for the purpose. It is Filament /) Condenser Slit Objective R-E.Cell. Figure 405. sealed in that position, for reasons which will be later explained. THE EXCITING LAMP.— The exciting lamp, sometimes called the "sound lamp," supplies illumination to the sound band. This illumination is steady. By that it is meant that the illumination of the sound band is at a fixed, steady value which does not vary. In front of the sound lamp and at a fixed distance therefrom is a piano convex condenser very similar to those used with the straight arc in motion picture projection, except that instead of being Ay2 inches in diameter this one is only about five-eighths {%) of an inch in diameter. Its purpose is to concentrate the light in a "spot" upon the "slit," just as the condenser concentrates the light in a spot at the projector aperture. In