Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 287
ator is usuallyattached to each bell,and when the push-button is depressed,not only does thebell ring, but theindicator falls, and, aslong as it is down,completes the circuitwithout the interven-tion of the button, sothat the bell continuesringing until the ser-vant whose businessit is to answer it…
Electric industries · Electricity
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