Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 287
Fig. 9i- APPLICATIONS OF ELECTRICITY. 267 Many shops and warehouses are now provided withelectric alarums, which set a bell ringing if the temperaturerises to such an extent as to indicate that a fire has brokenout, or, if no one is living on the premises, a signal isautomatically sent to the…
Electric industries · Electricity
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