The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 571
the fine pointand the rim of the small hole in the diaphragm, causing theresistance to vary in proportion to the intensity of the waves. 542 PRACTICAL TELEPHONE HANDBOOK The barretter is shunted by a circuit containing a battery andan ordinary telephone receiver as shown in Fig. 492. The… … Fig. 492.—Barretter Receiving Circuit, Fessendens System 2500 ohms, will respond to notes of 5000 vibrations per second,to a high-frequency voltage of 000015 volt or to a high-frequency current of 0-00006 milliampere. FessenderCs Thermal Barretter has also been used as a receiverwith good results.…
Telephone
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