"Television: the revolution," ([1944])

Page scan 00035 from "Television: the revolution,"

Record Details:

Title:
"Television: the revolution,"
Date:
[1944]
Publisher:
New York, Essential Books
Volume:
"Television: the revolution,"
Leaf #:
00035
Language:
English
Collection:
Books and Broadcasting & Recorded Sound
Format:
Books
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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16 TELEVISION: THE REVOLUTION America. Actually, the mathematics of what goes on inside the iconoscope is enough to send Dr. Einstein away for a rest-cure. But for all practical purposes, this simple description cov- ers quite accurately the events which take place inside the sealed glass tube of the tele-camera. Now, back to Miss Grable and the cathode beam. After the "electronic milk-man" has com- pleted one sweep across the mosaic, it zigzags back to the other edge and begins another sweep, slightly lower than before. This zigzagging by the cathode beam is called "scanning." At each tiny electric eye along the way, the cathode beam says, in effect, "How much electricity do you need?" And the electric eye, depending upon how big a spurt of electricity Miss Gra- ble's picture has caused it to give out, tells the cathode beam how much current it needs to come back to normal. And so the electronic milk-man scans the whole mosaic—giving a charge of electricity to each electric eye in pro- portion to the brightness of the light which fell on that particular part of the mosaic. All in all, the cathode beam makes five-hundred-and- twenty-five zigzag sweeps across the mosaic— each line being slightly lower than the one be-