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

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626 Laverty’s co-worker this table, Paul Christiansen, produced lithium which was used batteries.627 tested his lithium titration, method determining a constituent mixture volumetric analysis), using the burettes seen in 211 . mixed shellac and tetrachlomapthalene with numerous solvents and kept record the results. Historian’s Note 68. 625 Notebook N-ll-00-00.Table Record/Battery Experiments. 4522 Notebook N-09-04-20. They mark the first efforts to find materials for records, which dated from the late nineteenth century. 624 Notebook N-10-07-29. His laboratory notebook records the mixing chemicals and his letters indicate that he worked condensite.624 Laverty was also involved experiments phenol-based record materials. The wax and shellac materials used cylinders were early attempts find a recording medium which was easy mold and difficult break.623 Laverty had the task testing various solvents used alter shellac. 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.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.3. The idea was to crystallize the solution provide hard recording surface. 623 Notebook N-09-04-20 "Solvents" April 20, 1909."622 In 1909, Edison began experimental notebook devoted recording experiments on solvents used dissolve shellac and like substances. Paul Laverty worked both condensite for phonograph records and on the nickel flake used the Edison storage battery. This table has two unrelated experimental tasks occurring the same time and the same table—relatively common Edison’s laboratory. Both were inferior when compared celluloid and phenol resins. asked Laverty find out why this residue did not plate. 627 Laverty correspondence Historian’s Note 90. know lot about the work this table because the experimenter who worked here from 1909 1910 left several letters about his activities. Legal difficulties prevented Edison from using celluloid and forced him find a substitute.1.621 621 Historian’s Notes 68, 90, and contain recollections Paul Laverty