St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 97
Fig. 124. by removing the bell from an ordinary eledric bell.Buzzers are used in places where the loud sound of a bellwould be objedlionable. Fig. 124 shows the usual formof buzzers, the cover being removed. CHAPTER XVI. THE TELEPHONE, AND HOW IT TRANSMITS SPEECH. 119. The Telephone is an…
Electricity
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