The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 567
ary to a considerable extent and in exact 538 PRACTICAL TELEPHONE HANDBOOK accordance. As a strong current can be sent through, the plateswith no liability to heating, it will be seen that we have allthe requirements for a powerful form of transmitter with whichto vary, in one way or other, the… … Fig. 490.—Fessendens Trough Carbon Transmitter period of the alternator, and acts with regard to the ethericwaves in a somewhat analogous manner to that in which a barof steel fixed at one end and struck at the other gives rise tosound waves in the air, or is even more analogous to the…
Telephone
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