The talkies (1930)

Page scan 000179 from The talkies

Record Details:

Title:
The talkies
Date:
1930
Publisher:
London: Crosby Lockwood and Son
Volume:
The talkies
Leaf #:
000179
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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THE TALKIES II 5 was frequently possible to hear on the finished sound-track the sound of the sprocket perforations as they were engaged by the sprocket rollers which were drawing the films through the machine. This was found to be due to two causes; the first of these was a purely optical one, and the second a rather unexpected mechanical one. Troubles are still being experienced due to slight irregularities in the perforations on the film, and it was found that noise and vibration was being caused by the fact that three pairs of perforations were engaged at a time on each side of the film as it travelled through the machine. The first pair were just engaging with the sprockets, the second pair were actually in mesh, the third pair being just on the point of release, thus putting stresses on to the film which caused sufficient vibration to be heard on the soundtrack. The optical trouble was caused by the mask that covered the sound-track section while the picture was being printed. It did not adequately prevent light from getting on to the masked portion by way of the perforations. In order to avoid these optical difficulties, efforts are being made to allow a margin of about 1 or 2-thousandths of an inch between the