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These twenty-seven notebooks were used during 1911-1920 for notes on chemical preparations and experiments pertaining to storage batteries, disc records, and other applications. The experimenters include Peter C. Christensen, W. B. Davis, Frank Detlef, Jr., N. M. Elias, A. W. Henzell, F. Walter Horner, D. Juan Marley, William H. Mason, H. J. Miller, Y. Nakamigawa, Edwin N. Rosenfield, Frank S. Shapiro, Edwin Smith, Jr., Robert E. Waterman, C. G. Williamson, and Max Young. There are notes relating to various batches of chemicals and chemical reagents, including paraphenylenediamine ("para"), acetanilide, paranitroacetanilide, nitrobenzene, aniline, phenol, chloronitrobenzol, Castner soda, lacquers, shellacs, and Vaseline. Also included are experimental notes on the sulfonation of benzol, the silvering of mirrors, colloids, metallic flake, alpha-naphthol, and naphtha residue. Four notebooks with notations by Edison have been selected in whole or in part.