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

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45 ., pp. (Condensite refers the condensation phenol and formaldehyde which produces the resin.) 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. 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.1904), Notebook N-99-06-24.1. 1932), 407. Rosanoff, "Edison His Laboratory," Harpers Magazine 165, (Sept."121 These rooms were probably the third floor Building 5 (see figures 134-136).118 MjV. 119 Ibid. 121 TAE Sigmund Bergmann, November 29,1904, Letterbook 71, 169 (LB071169). 119 MA.119 Rosanoff also had room elsewhere the laboratory, probably Building 5. Aylsworth improved the phenol resins first developed Leo Baekeland and produced material called condensite, purer resin with fewer by-products. Numerous other substances were the subject experiment and testing: stearic acid compounds, asbestos, celluloid, montan wax, ceresin, and beeswax.120 In 1903, Edison thought had found winning chemical combination and he introduced his new product, the type nickel-iron battery, onto the market. 120-121. recalled seeing Edison and Fred Ott the laboratory the experimental tables throughout the night. 130-132.Aylsworth experimented with compounds that could easily molded into shape and would not deform shrink with heat. 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. Rosanoffjoined the laboratory 1903.117 117 Vanderbilt, Thomas Edison, Chemist, pp. The thermo-setting resins were not the only ones under investigation for possible use records. Rosanoff. started work on finding better combinations for the waxes that Aylsworth had developed the nineteenth century for cylinder records. Like the "boys" Menlo Park, the staff worked all night. Faced with serious problems this project, Edison fitted two rooms the laboratory and put testers work there "night and day. The battery sold well but soon complaints began arrive the laboratory about leaks in the battery and losses charge