A B C of television; or, Seeing by radio; a complete and comprehensive treatise dealing with the theory, construction and operation of telephotographic and television transmitters and receivers; written especially for home experimenters, radio fans and students.. (1929)

Record Details:

Title:
A B C of television; or, Seeing by radio; a complete and comprehensive treatise dealing with the theory, construction and operation of telephotographic and television transmitters and receivers; written especially for home experimenters, radio fans and students..
Date:
1929
Publisher:
New York, The Norman W, Henley publishing co.
Volume:
A B C of television; or, Seeing by radio; a complete and comprehensive treatise dealing with the theory, construction and operation of telephotographic and television transmitters and receivers; written especially for home experimenters, radio fans and students..
Leaf #:
000175
Language:
English
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 20, 2022
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144 A. B. C. OF TELEVISION of life. Even cells made under identical conditions may show life spans of wide variations, some lasting for weeks, others for months or even years. Every selenium cell has what is known as a lag or inertia. This lag is the time that expires between the instant that the FIG. 46.—This curve was taken to show the lag of selenium in returning to its point of normal or "dark resistance" after being exposed to a source of light. light falls upon the cell and the instant that the resistance of the cell drops in response to the light. This lag is controllable to a certain degree by the design of the cell itself and the method used in preparing the selenium. As a general rule we might say that the higher the resistance of a cell the less its inertia. It may further be claimed that the higher its resistance the greater the ratio of sensitivity. This inertia not only opposes the drop in resistance when the cell is illuminated, but it also opposes to a much greater degree the return to normal resist-