The talkies (1930)

Page scan 00079 from The talkies

Record Details:

Title:
The talkies
Date:
1930
Publisher:
London: Crosby Lockwood and Son
Volume:
The talkies
Leaf #:
00079
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 47 The method employed is to start and keep the lamp glowing by applying to it a suitable electrical potential and then to superimpose further electrical fluctuations from a valve amplifier which is controlled by the studio microphones. Unfortunately, however, this type of lamp is not necessarily entirely reliable, and is apt, among other things, to go out — quite apart from the fact that the illumination variation is not always strictly proportional to the strength variations of the microphone impulses except between rather narrow limits, and that its light is generally rather poor. A further problem to be faced is that, except over a certain range of densities, the response of the light-sensitive emulsions available for soundrecording films are, like the response of the lamps, not always in strict proportion to, in this case, the amount of light falling on to them, except within certain narrow limits; that is to say, at certain strengths of illumination an increase of illumination will not always produce the same increase in density. Again, unless the illumination is sufficiently powerful, very full "modulation" of the light by the microphone might result in certain kinds of lamp being at times almost extinguished, with