The talkies (1930)

Record Details:

Title:
The talkies
Date:
1930
Publisher:
London: Crosby Lockwood and Son
Volume:
The talkies
Leaf #:
00082
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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50 THETALKIES to pass on to the film on which the sound is being recorded. This system has the advantage of allowing a light of any convenient power to be used, and does not reduce the amount of light available for the film to the extent which the electro-optical shutters are apt to do. The Western Electrical Company, who use the variable density method, make use of a loop of wire to "shutter" the light which is to fall on to the film. One side of this loop passes down between the magnets and the other side passes upwards. The electrical impulses from the microphone pass therefore down one side in one direction and up the other side in the opposite direction, the two sides of the loop moving in opposite directions, at one moment closing together and at the next separating from each other, the light being passed through the space between the two wires as they quiver with the message from the microphones. Only a narrow slit of light reaches the film, and this is obtained by an optical method because, among other things, it would be very difficult to keep a mechanical slit only a thousandth of an inch wide free from dirt and dust. The light is therefore passed through a slit of conveniently large dimensions, and the image of this slit is reduced in size by a