Nation projector carbons (1935)

Page scan 00031 from Nation projector carbons

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00031
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:
May 30, 2024
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The Carbon Arc In the projection of motion pictures it is highly desirable that all portions of the screen be equally illuminated. To accomplish this an evenly distributed field of light must pass through the aperture plate onto the adjacent film. The crater of the carbon arc, practically uniform in intrinsic brilliancy and providing a large volume of light within a small area and practically within one plane, is readily focused on the aperture plate in a beam of uniform intensity. Xo other source of light compares with the carbon arc in its adaptability to the problems of projection. Its flexibility permits the light to be increased by increase of current when dark or colored films are being shown and decreased by lowering the current when less illumination is required. In electrical efficiency the carbon arc likewise stands supreme. It already occupies the field of theatre projection to the practical exclusion of all other light sources and recently developed projection lamps of low amperage, and simplified operation promise to extend the use of the carbon arc into school rooms, lecture halls. and small auditoriums for which the smallest arc lamps heretofore available provide a much greater volume of light than is required. 27