. Journal of electricity. by providing a chamber within the burner which is largeenough to contain sufficient gas to produce an explosion inthe event of a flash back, and this chamber is so connectedwith the gas passage in the burner that the explosive gasesare directed toward the end of the burner, whereby the flameis blown out and a flash back into the pipe Fire Alarm and AnnunciatorPatent No. 1,249,717, issued to John Carrigan of Seattle,Washington, discloses a novel form of combined firm alarmand annunciator. This device comprises a plurality of drop. wire. The apparatus
. Journal of electricity. by providing a chamber within the burner which is largeenough to contain sufficient gas to produce an explosion inthe event of a flash back, and this chamber is so connectedwith the gas passage in the burner that the explosive gasesare directed toward the end of the burner, whereby the flameis blown out and a flash back into the pipe Fire Alarm and AnnunciatorPatent No. 1,249,717, issued to John Carrigan of Seattle,Washington, discloses a novel form of combined firm alarmand annunciator. This device comprises a plurality of drop. wire. The apparatus consists of a rotatable head having aslot therein to receive the feed wire and having a jaw there-on for gripping the end of the service wire. The head is pro- annunciators, a testing button for each drop, and a reset mag-net for the drops. A gong is included in the device and meansare provided for cutting the gong in or out of the annunciatorcircuit, so that the device may be used as a fire alarm whendesired. February 1, 1918] JOURNAL OF ELECTRICITY 149
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Keywords: ., bookcentury1900, bookdecade1910, bookidjo, booksubjectelectricity
