. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . AM. PHOTO-LITHOGRAPHIC CO. ;£ I OSBOHHEs PROCESS., 123,984 United States Patent Office. THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. 0. IMPROVEMENT IN TELEGRAPH APPARATUS. Specification forming part of Letters Patent No. 123,984, dated February ^7, 1872; antedated February 17, 1872. To all ivhom 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;

---

. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . AM. PHOTO-LITHOGRAPHIC CO. ;£ I OSBOHHEs PROCESS., 123,984 United States Patent Office. THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. 0. IMPROVEMENT IN TELEGRAPH APPARATUS. Specification forming part of Letters Patent No. 123,984, dated February ^7, 1872; antedated February 17, 1872. To all ivhom 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 he 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 per-forated paper, and their reception upon chem-ically-prep

---

Size: 1783px × 1401px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone