The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 565
thealternator, and 80,000 cycles per second are now easily obtained.At 150 volts and 5 amperes of current this is said to becapable of telephoning over 200 miles. 536 PRACTICAL TELEPHONE HANDBOOK In operation the alternator is generally connected to the aerial, a high vertical conductor (which, in… … Fig. 488.—Fessenden Alternator for Wireless Telephony an inductance and the primary of an adjustable variable trans-former, which latter has inductive cores. For telephoning overa line of ten miles, in one instance the primary turns of thetransformer were ten, and current through them 2J…
Telephone
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