St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 95
This adlion is repeated, the rapidity of the vibrationsdepending somewhat upon the position of the wires on I.In regular instruments a platinum point is used where 91 92 THE ELKCTRIC BEEL AND SOME OP ITS USES. … Fig. 117. the circuit is broken ; this standsthe .sparking when the armaturevibrates. 116. Electric Bells may beillustrated by referring to Fig.116, which shows a circuit sim-ilar to that described in § 115,but which also contains a keyK, in the circuit. This allowsthe circuit to be opened…
Electricity
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