The talkies (1930)

Record Details:

Title:
The talkies
Date:
1930
Publisher:
London: Crosby Lockwood and Son
Volume:
The talkies
Leaf #:
00083
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 51 series of lenses until it appears on the film exactly the right size. The Radio Corporation of America use a similar image of a slit rather than the actual slit itself, but as they use the variable area method of recording, their light arrangements are slightly different. They also employ a wire down which a current is passing placed near a magnet. But while their wire is also arranged in the form of a loop, in the R.C.A. recorder the whole loop tries to twist when a current passes round it. On this loop is mounted a tiny mirror which twitches this way and that, when the vibrating currents from the microphone pass round the loop of wire to which it is attached. A ray of light which is focused on to this mirror is therefore moved backwards and forwards across the slit, making the zigzag margin between the clear and exposed film. The recording range of these commercial light-recorders has until recently been limited to about 7,000 vibrations per second. The "His Master's Voice" engineers have however recently staggered the scientific and motion-picture world by demonstrating a commercial film recorder which will record nearly double the range of vibrations possible before, of 25 to 15,000 vibrations per second !