. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . N- PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, [ 2 Sheets-Sheet 2. T. A. ALARM AND SIGNAL 186,548. Patented Jan. 23/ , PHOTO-LITHOGRAPHER, WASHINGTON. D C. United States Patent Office. THOMAS A. EDISON, OP MENLO PARK, NEW JERSEY, ASSIGNOR TO THEDOMESTIC TELEGRAPH COMPANY, OE NEW YORK. IMPROVEMENT IN TELEGRAPHIC ALARM AND SIGNAL APPARATUS. Specification forming part of Letters Patent No. 186,548, dated January 23, 1877 ; application filed May 18, 1876. To all whom it may co
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . N- PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, [ 2 Sheets-Sheet 2. T. A. ALARM AND SIGNAL 186,548. Patented Jan. 23/ , PHOTO-LITHOGRAPHER, WASHINGTON. D C. United States Patent Office. THOMAS A. EDISON, OP MENLO PARK, NEW JERSEY, ASSIGNOR TO THEDOMESTIC TELEGRAPH COMPANY, OE NEW YORK. IMPROVEMENT IN TELEGRAPHIC ALARM AND SIGNAL APPARATUS. Specification forming part of Letters Patent No. 186,548, dated January 23, 1877 ; application filed May 18, 1876. To all whom it may concern: Be it known that I, TnoMAS A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented an Im-provement in District and Fire^ Alarm Tele-graphs, of which the following is a specifica-tion : The object of this invention is to provide acheap and reliable alarm, adapted to smallcities and towns, for giving fire-alarms or othersignals. I make use of a central station, with one ormore lines running to the respective signal-iustruments, which may be similar to thoseshown in Letters Patent No. 169,972, and areplaced in a branch running to earth. Whenthe signal-instrument is operated an alarm isg
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