Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 123
112 PRACTICAL WIRELESS TELEGRAPHY. greatly impede the radio-frequency oscillations. Hence the secondary winding is protectedfrom injury. 108. High Voltage Transformers.—The construction of the open andclosed core types of transformers of the Marconi Company is shown in Figs. 131and 132. The primary… … CONDENSES . Fig. 130—High Frequency Choking Coils. several* layers of insulating tape followed by two or three layers of rather coarsecopper wire, such as No. 10 or No. 12 S. C. C. The entire primary is then in-serted in an insulating tube. The secondary winding is composed of several sec-tions,…
Telegraph, Wireless
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