International Review of Educational Cinematography (Jul-Dec 1929)

Page scan 000288 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 #:
000288
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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Figures three and four show it closed and opened. The movement is produced by an electric motor, the contact of which is shown in figure four on the left below ; there is also a meter, a tachometer and a punch to stamp the films, besides the Fig. 3 already mentioned finder which can be used while filming and is completely free from parallax. As is shown by figure 4, the two vertical reels, which include a hundred and twenty metres of film, are fixed at the sides of the apparatus. The film is adapted to the horizontal passage channel by means of two rollers. Their movement is not regulated by clamps but by an accurate maltese cross gearing, allowing the use of a shutter with an opening to two hundred and thirty degrees. The ordinary apparatus for non-colored filming have much smaller apertures so that less light is needed for the formation of the image. The same frequency of images therefore causes a stronger illumination of the film, which is exactly what is required, as the films absorb a great deal of light. The images taken this way are better connected in the projection and are therefore less disunited. The shutter could not be installed between the objective and the film, as is usual ; but had to be placed before the objectives in order to obtain an absolutely synchronous opening and closing of the optical systems relating to the partial images. — 274