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

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624 Laverty was also involved experiments phenol-based record materials. know lot about the work this table because the experimenter who worked here from 1909 1910 left several letters about his activities.626 Laverty’s co-worker this table, Paul Christiansen, produced lithium which was used batteries. Historian’s Note 68. Both were inferior when compared celluloid and phenol resins. 4522 Notebook N-09-04-20. 627 Laverty correspondence Historian’s Note 90."622 In 1909, Edison began experimental notebook devoted recording experiments on solvents used dissolve shellac and like substances. One his options was shellac, and experimented make soft enough mould into records and then hard enough preserve the spiral groove of sound waves, "of such hardness and toughness that approaches celluloid.Table Record/Battery Experiments.625 One interesting experiment described Laverty was based Edison’s need to know about the sludge left the bottom the electroplating baths make nickel flake. mixed shellac and tetrachlomapthalene with numerous solvents and kept record the results. They mark the first efforts to find materials for records, which dated from the late nineteenth century.1. Legal difficulties prevented Edison from using celluloid and forced him find a substitute. 624 Notebook N-10-07-29. This table has two unrelated experimental tasks occurring the same time and the same table—relatively common Edison’s laboratory.3. 623 Notebook N-09-04-20 "Solvents" April 20, 1909. The idea was to crystallize the solution provide hard recording surface. 625 Notebook N-ll-00-00.623 Laverty had the task testing various solvents used alter shellac.621 621 Historian’s Notes 68, 90, and contain recollections Paul Laverty. Paul Laverty worked both condensite for phonograph records and on the nickel flake used the Edison storage battery.627 tested his lithium titration, method determining a constituent mixture volumetric analysis), using the burettes seen in 211 . asked Laverty find out why this residue did not plate. His laboratory notebook records the mixing chemicals and his letters indicate that he worked condensite. The wax and shellac materials used cylinders were early attempts find a recording medium which was easy mold and difficult break