Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000101
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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MANAGERS AND PROJECTIONISTS 1025 The Vacuum Tube as an Amplifier WE will now proceed to examine the vacuum tube regarding its action in amplifying the electric impulses coming from the sound pickup apparatus, sending it forward to the horns or loud speakers vastly more powerful than it was before its passage through the tubes. The amplifying tube does not really amplify the impulses at all, in the true sense. What it does is use the very weak impulses emanating from the pickup at the projector to duplicate those impulses in a very much more powerful electric current. Get that fact fixed clearly in your mind and you will the more readily understand what follows. When a current-conducting filament is placed in an air-tight receptacle, such as a glass tube, the air exhausted • therefrom, and a sufficient current is sent through to heat the filament, it has boiled out of it, or "throws off" negatively charged particles of electricity called electrons, which travel at high velocity and in straight lines. It is this condition which makes possible the amplification of sound, because, as will hereinafter be explained, means have been found to control the action of the electrons thus thrown off in a vacuum tube, and to, by them, force duplications of the impulses contained in the current coming from the pickup in a current of far greater power. 4