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
43
ards and so arranged that the distance between the elec-
trodes can be accurately adjusted. The electrodes usually
take the form of hollow faced cylindrical rods having
Fig. 52.—Photo of spark gap.
flanges to radiate the heat generated and prevent the spark
from arcing. Various metals are used for spark gaps.
Silver is probably the best but its expense is prohibitive.
A special hard zinc alloy is most generally used.
Fig. 53.—Quenched spark gap.
Spark gaps take other forms, two of which are interest-
ing and important enough to describe here.
The first is the rotary gap. This consists of a number
of small electrodes set around the periphery of a wheel