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

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Aylsworth experimented with compounds that could easily molded into shape and would not deform shrink with heat. 45 . 119 Ibid. started work on finding better combinations for the waxes that Aylsworth had developed the nineteenth century for cylinder records.119 Rosanoff also had room elsewhere the laboratory, probably Building 5. Numerous other substances were the subject experiment and testing: stearic acid compounds, asbestos, celluloid, montan wax, ceresin, and beeswax.1. (Condensite refers the condensation phenol and formaldehyde which produces the resin. Rosanoff, "Edison His Laboratory," Harpers Magazine 165, (Sept. The battery sold well but soon complaints began arrive the laboratory about leaks in the battery and losses charge. 121 TAE Sigmund Bergmann, November 29,1904, Letterbook 71, 169 (LB071169). Aylsworth improved the phenol resins first developed Leo Baekeland and produced material called condensite, purer resin with fewer by-products. 120-121. Rosanoffjoined the laboratory 1903. The thermo-setting resins were not the only ones under investigation for possible use records. examined the properties of phenolic resins which could molded heat and pressure and found that they could mixed with binding agents and molded into hard, heat-resistant shapes.118 MjV. Rosanoff. recalled seeing Edison and Fred Ott the laboratory the experimental tables throughout the night. 120 Shop Order 1567 (ca. Various combinations asphalt, wood flour and china clay were tried, and finally mixture phenol and wood flour was used for the record base.) The actual cylinder disc record was never blank pure resin but a combination cheaper materials for the base covered with "varnish" the hard recording medium. 1932), 407.120 In 1903, Edison thought had found winning chemical combination and he introduced his new product, the type nickel-iron battery, onto the market. 130-132."121 These rooms were probably the third floor Building 5 (see figures 134-136). 119 MA., pp. Like the "boys" Menlo Park, the staff worked all night.1904), Notebook N-99-06-24. Faced with serious problems this project, Edison fitted two rooms the laboratory and put testers work there "night and day.117 117 Vanderbilt, Thomas Edison, Chemist, pp