The talkies (1930)

Record Details:

Title:
The talkies
Date:
1930
Publisher:
London: Crosby Lockwood and Son
Volume:
The talkies
Leaf #:
00089
Language:
English
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 28, 2024
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THETALKIES 55 ments showed that these clear portions occurred where the glass had been protected by the intact portion of the filament from the spot where it had actually burnt through, that is, where there had been an excessive amount of heat generated. It was ascertained that when certain metals are heated they, like the metal plates under the influence of light, surround themselves also with a cloud of negative electricity, and that therefore there are at least two ways of causing a metal to release this cloud: (i) by shining a light on to it, (2) by heating it. The minute electrical impulses from the photoelectric cell, where action depends on the first method, are strengthened by their cousins the amplifier valves, which rely on the second method, in order that they may be used for controlling the loudspeakers in the cinemas. Let it not be forgotten that it was Mr. Lee de Forest, the inventor of the three-electrode wireless valve, who first showed a practical Talking picture, using sound photographed on to a film. The photo-electric cell of the Talkie projector is a metal plate on which a light is shining through the film which carries the sound-images. As the film passes between it and the light, so the amount