International Review of Educational Cinematography (Jul-Dec 1929)

Page scan 000425 from International Review of Educational Cinematography

Record Details:

Title:
International Review of Educational Cinematography
Date:
Jul-Dec 1929
Publisher:
International Educational Cinematographic Institute
Volume:
International Review of Educational Cinematography (Jul-Dec 1929)
Leaf #:
000425
Language:
English
Collection:
Non-Theatrical Film
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Date Added:
September 12, 2024
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and red tinted films are placed side by side on longitudinal ribbons and paralleled in the diaphragm passage. It. is well known that the diaphragm always appears as a luminous surface of uniform brilliancy in relation to the several points of the clear image. A film spread over with panchromatic emulsion and c< craped » on the emulsionised side is used for the sensitive surface. This a craping » is done by an indented roller by means of which an enormous number of little hexagonal bulges (500 to 1000 per square milimetre) are impressed on the film. The film is then placed in the camera so that the « craped » surface faces the objective. Each of the tiny « craped » protuberances produces on the sensitive stratum a tiny image of the ensemble of the view embraced by the objective through the coloured screen. Thus the same result is obtained as if one placed a network of violet, green and red elements in contact with the emulsion, as in the autochrome plate. Fig. 3 shows the passage of the rays of light both inside the view finder and the projector. The same phenomena occur in both cases. The same objective furnished with its tri-coloured diaphragm is placed in position for projecting the positive 409 —