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Discover More ; By law, every fire escape was rigged with a fire alarm, in addition to the regular burglar alarm. From Project Gutenberg ; This is the bell that belonged to the "burglar-alarm," lately connected with the show-case, &c. From Project Gutenberg ; This is the wire that rang the bell, that belonged to the "burglar-alarm," lately connected with the show-case, &c. From Project Gutenberg ; An electric fire detector in the cellar acts much like a burglar alarm. From Project Gutenberg
With just a battery and buzzer, these designs make for fairly flawed security systems. After all, the burglar only needs to close the door again to turn the buzzer off. That's why most...
도서 문헌정보 ; 제목 : Domestic Security: The Holmes Burglar Alarm Telegraph, 1853-1876, 저자 : Karen C. S. Donnelly, 발행인 : Graduate School of Arts and Sciences, University of Pennsylvania, 1992, 길이 : 600페이지, 서지정보 내보내기 : BiBTeX EndNote RefMan
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