Wireless Telegraphy and Telephony
Forfatter: Alfred P. Morgan
År: 1917
Forlag: The Norman W. Henley Publishing Company
Sted: New York
Udgave: Third Edition, Fully Illustrated
Sider: 33
UDK: 621.396.1 Mor
A practical Treatise on Wireless Telegraphy and Telephony, giving Complete and Detailed Explanations of the Theory and Practice of Modern Radio Apparatus and its Present Day Applications, together with a chapter on the possibilities of its Future Development
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WIRELESS TELEGRAPHY
57
the hole O' is intermittent, passing principally in one direc-
tion. It may be likened to the intermittent direct current
produced by the detector.
Some of the many forms of detectors are interesting
because of the ingenious manner in which equivalent re-
Fig. 70.—Perikon detector.
suits are attained. The illustration shows a type of de-
tector known as the “Perikon.” Two minerals, zincite
(oxide of zinc) and chalcopyrites (copper-iron sulphide),
are mounted in adjustable cups so arranged that the sur-
faces of the minerals can be brought into variable contact
with one another.
Another very good rectifying detector is that consisting
of a flat surface of highly polished silicon mounted in a