The audio-visual handbook (1942)

Page scan 000197 from The audio-visual handbook

Record Details:

Title:
The audio-visual handbook
Date:
1942
Publisher:
Chicago : Society for Visual Education, Inc.
Volume:
The audio-visual handbook
Leaf #:
000197
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
May 09, 2024
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Types of AudioVisual Aids to Instruction 179 At the receiving point, some form of printing mechanism is necessary which screens the receiving paper in exact juxtaposition with the sending point. This reconstructs a large number of dots or lines across the page, in exactly the same relative position and in the same density; Photo Courtesy RCA Manufacturing Co., Inc. Facsimile Receiver in a sense halftoning or screening the picture. One of the major practical difficulties is the fact that whereas these commercial units have skilled engineers operating the receivers, the home receiver has to work automatically without any processing on the part of the home owner. This must be simplified and made as foolproof as possible, and there have been important strides in that direction during the past year. The sending equipment, called a scanner, is being sold to various broadcasting stations which are experimenting with it at present, and the Radio Commission to date has issued only experimental authorizations. This equipment cannot be used for commercial purposes. The majority of these are newspaper-owned. The sending equipment can be used on any wave length transmitter in broadcasting. That automatically places it into two wave lengths: the normal broadcasting band, and the experimental band — ultra-high frequency. Technically, the major difference in those two is that fac