. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . United States Patent Office THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. C. IMPROVEMENT IN TELEGRAPH APPARATUS. Specification forming part of Letters Patent No. 123,9$<1, dated February 27, 181$; antedated February 17, 1870. To all whom it may concern: Be it known that I, Thomas A. Edison, ofNewark, in the county of Essex and State ofNew Jersey, have invented an Improvementin Telegraph Apparatus; and the following isdeclared to be a correct description there
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . United States Patent Office THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. C. IMPROVEMENT IN TELEGRAPH APPARATUS. Specification forming part of Letters Patent No. 123,9$<1, dated February 27, 181$; antedated February 17, 1870. To all whom it may concern: Be it known that I, Thomas A. Edison, ofNewark, in the county of Essex and State ofNew Jersey, have invented an Improvementin Telegraph Apparatus; and the following isdeclared to be a correct description thereof. The object of this invention is to give theoperator at the sending station the opportu-nity to adjust the instruments on the line insuch a manner as to bring into action the re-ceiving instrument at any desired station in-dependently of the operator at that station. This invention is primarily adapted to thetransmission of messages automatically by-perforated paper, and their reception uponchemically-prepared paper; but the said in-vention may be employed in other teleg
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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
