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

Record Details:

Title:
"Television: the revolution,"
Date:
[1944]
Publisher:
New York, Essential Books
Volume:
"Television: the revolution,"
Leaf #:
00033
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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14 TELEVISION: THE REVOLUTION strip of motion picture film. A great many mole- cules of silver would begin jumping around, and chemical changes would take place to produce a photograph. But inside the iconoscope, the picture is projected on a metal plate, called a "mosaic." This mosaic is slightly smaller than a post-card, and contains several million sepa- rate "electric eyes" or photo-electric cells. They are so tiny and so close together that only a pow- erful microscope can show them separately. Each of these "electric eyes" in the mosaic is chemically constructed to give out a spurt of electricity every time a ray of light falls upon it. In other words, bright light—big spurt of elec- tricity; darkness—none. Now we have converted Miss Grable into an impression on a metal plate consisting of several million spurts of electricity. How are we going to arrange them in order so that they can be broadcast, put back together at the receiving end, and still look like Betty Grable? That's where the cathode beam comes in. For all practical purposes, we can consider a cathode beam as a wire carrying a charge of cur- rent—except there is no wire. A cathode beam is a stream of rapidly moving electrons. It can