Beschreibung:

[Science, Medicine & Mathematics] [Edison, Thomas A.] Group of Four Manuscript Documents, signed (New York), January 21, 1879. 5 pp., on legal size paper. Agreement between Edison and the Gold and Stock Telegraph Company of Canada for the transfer of patent rights of "certain improvements in speaking Telephones...within the Dominion of Canada...", and for Edison to provide for the production of the telephones in Canada. Edison was to recieve "a royalty of one dollar in gold per annum for each and every set of telephonic apparatus leased, operated or used under said letters patent..." Signed by Edison and countersigned by George Walker Vice President of the Gold and Stock Telegraph Co., and by Stockton L. Griffin, Edison's personal secretary. Including an additional unsigned copy of the above agreement in another hand. Also including another 5 pp. manuscript document copy of the same in another hand. With an additional two sections further delineating the above contract on verso of final page. Dated November 12, 1880, and signed by Edison and countersigned by William J. Hammer, an employee in the electric light division. With an autograph note following the above signed by William Carman, an accoutant at the Electric Pen Co. Also including four autograph letters signed by Charles P. Sclater, Secretary-Treasurer of the Gold and Stock Telegraph Company, to John Van Horne, Vice-President of the Gold and Stock Telegraph Co; clipped together at top. Dated March 20-April 28, 1882. Docketed on verso, with notes from L.E. Lefferts, Secretary to the President of Gold and Stock Telegraph Co., requesting copies of the Edison agreement above. At the end of 1878 Edison developed a Carbon Telephone Transmitter, and by the beginning of 1879 developed the Electro-motorgraph speaking telephone reciever. The basic design of Edison's telephones were in common usage until the introduction of digital telephones in the 1980s.