Edison, Thomas. (1847–1931) Important Archive of Autograph Letters, Original Diagrams and Instructional Sketches for Disc Record ManufactureAn extraordinary and highly important archive of materials related to the development of Edison's disc records, including the design and production of the records themselves and the machines for the pressing of the discs and their coating in a newly developed material, condensite. Including 23 diagrams and instructional drawings on 22 sheets and 7 notes letters (4 signed "Edison", one initialed), generally addressed to Charles W. Luhr (Vice President
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Edison, Thomas. (1847–1931) Important Archive of Autograph Letters, Original Diagrams and Instructional Sketches for Disc Record Manufacture