International Library of Technology · Scranton, International Textbook Co. · leaf 694
r-dinary round push button. Thewires enter through holes in thebase and attach to springs b andc. The cover d screws on, andwhen e is pushed, b and c cometogether, thus completing thecircuit. One cell of any good type ofbattery will ring a good bell overa short length of wire, but it is never… … fig. § 28 INTERIOR WIRING. 27 terminals at the ends of the row of cells connected to theline wires. 35. Electric bells can be had of all sizes, from meretinklers up to the largest fire gongs. Very cheap bellsshould not be used. They require much battery power,and soon get out of order. Trouble is…
Electrical engineering
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