International Review of Educational Cinematography (Jan-Dec 1932)

Record Details:

Title:
International Review of Educational Cinematography
Date:
Jan-Dec 1932
Publisher:
International Educational Cinematographic Institute
Volume:
International Review of Educational Cinematography (Jan-Dec 1932)
Leaf #:
000775
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 21, 2023
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751 at a normal speed, the movements appear to the spectator to be slowed down, so that their various phases can be exactly followed and analysed. This kind of high speed registration is called accelerated taking of pictures. On the other hand, when the phenomenon has so slow a development that it cannot be perceived in continuous fashion by microscopic observation, as often happens in growth phenomena and cell movement and division, it is possible to increase at will the interval between photograms. If the film is allowed to run through the projector at a normal speed of 16 to 20 photograms a second, the impression of an accelerated movement is obtained. The real duration of the movement is reduced in the reproduction and these low frequency registrations are called slow motion cinematography. The following table shows the relation between the number of photograms per second and the slowing down or speeding up of the movement during the normal speed projection. Number of photograms per second Slowing down or speeding up 160 80 48 32 16 8 4 2 slowing down 10 times 5j rt f ยป D I spe 2J Normal speed speeding up 2 times 4 \ 8 16 2 32 3 48 4 64 5 80 6 96 slow m 8 124 I 9 144 10 160 15 240 20 320 30 480 60 960 1 speeded up registration When the phenomena of movement of growth or cell culture to be registered with micro-cinematography develop with great slowness, it will be necessary to use the system of slow motion registration, that is leaving