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 #:
000179
Language:
English
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 20, 2022
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148 A. B. C. OF TELEVISION that due to Bidwell. Bidwell produced his cell by winding two wires upon a piece of mica in the manner shown in Fig. 48. The two wires were separated and naturally insulated from each other, the pitch of the spiral being 1/16 inch. Selenium was spread over these wires in a manner which will be described in a subsequent part of this chapter. A Townsend type cell is shown in Fig. 49. Here sheets of brass are separated by mica and selenium placed over the re sulting surface. On examining these various types of cells FIG. 50.—Mercadier selenium cell is made by winding together two strips of brass, the stripes being separated by a third strip of insulating material. we will readily see that a selenium cell simply consists of two metal conductors separated and with the intervening space covered with selenium. As before stated, the space should be small. In Fig. 50 there is a cell structure due to Mercadier. This takes the form of two brass ribbons between which there is sandwiched a ribbon of insulating material. These elements are wound up in the form shown and placed between two in sulating clamps. Selenium is spread over the resulting surface.