The talkies (1930)

Page scan 000151 from The talkies

Record Details:

Title:
The talkies
Date:
1930
Publisher:
London: Crosby Lockwood and Son
Volume:
The talkies
Leaf #:
000151
Language:
English
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 29, 2024
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THETALKIES 93 use of metal cog-wheels, and these have been now replaced with gear-wheels ingeniously moulded at high pressure out of non-metallic substances, such as paper and the black and brown material familiar to most of us made up into knobs for tuning radio sets. For various reasons, which we need not go into now, spring belts have in the past been used to connect the rotating film-magazines to the shutter mechanism. These were found to be a fruitful source of noise, and have been replaced, in the newly designed Talkie cameras, with belts of linen and other materials held at the right tension by an ingenious arrangement of spring pulleys, so that they are allowed enough stretch to take up any fluctuations in the tension of the film as it passes from one magazine to the other over the toothed rollers or sprockets which feed it past the shutters and lenses. These sprockets gave trouble in rather an unexpected way ; it was found that a considerable amount of noise was caused by the teeth on them as they engaged with the perforations cut in the film ; this trouble was, of course, aggravated by the fact that the cameras were being run faster than the speed that they were designed for. By dint of reducing the speed and range of move