EDISON LABORATORY Edison National Historic Site West Orange, New Jersey Volume 1

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graduate Rutgers College, Marshall joined the Edison laboratory when first opened 1887, after leaving his job chemical testing laboratory the New York, Erie, and Western Railroad. variety different materials were tried recording surfaces: resins, gums, waxes, asphalt, and solid fatty acids and their salts, such stearic acid. Marshall described him quiet plodder and his lack supervisory duties the laboratory might indicate retiring personality. 118-22. Sperling, "Jonas Aylsworth: Leif Erickson Interpenetrating Polymer Networks," unpublished manuscript Edison National Historic Site. His work was of the greatest importance the Edison phonograph business. Although worked Building his main place work was his house Orange, where had fully equipped laboratory. During this period was not paid weekly like the rest the experimenters but had special contract with Edison that paid him fixed yearly amount.116 The requirements for record compounds were demanding.C. worked a table next Aylsworth’s Building insulation and inorganic incandescent filaments.: American Chemical Society, 1971), pp.H., pp. Frank Dyer Aylsworth, August 1910 (in DF 1910, WOL-Employees).David Trumbull Marshall. The material had soft enough take the impression indentation the recording stylus but then made hard enough hold the analog signal for adequate reproduction. Aylsworth joined Edison’s laboratory 1887 after studying for one year Purdue University. 116 Aylsworth was important Edison that was prepared pay him whatever wanted. Jonas Aylsworth.116 44 . During the early part the twentieth century, Aylsworth was charged with finding harder compound for the disc records which could stand the diamond stylus. worked Buildings and 1891 he moved Edison Lamp Company factory New Jersey and supervised the production cellulose filaments. The material had able hold groove few thousandths inch deep and maintain over numerous plays. Edison supported expenses the lab Aylsworth’s house.113 113 Ibid. 115 Byron Vanderbilt, Thomas Edison, Chemist, (Washington, D. 60-75. Aylsworth spent years developing these substances and testing their performance phonograph cylinders. also worked the machine shop and probably served some time in the lamp experimental room the second third floor Building left the laboratory 1890. 114 L. returned the West Orange laboratory in 1894 and thereafter was closely involved Edison’s search for the perfect recording medium.114 Aylsworth’s forte was the waxes and resins used in recordings