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These three books were used in 1920 and 1921 by Frank Detlef, Jr., for notes on experiments on the plating solution used in producing disc records and in the master plating process. There are also references to work done by Ludwig F. (Louis) Ott and Howard F. Redford. Some of the entries consist of a day-to-day record of analysis of the plating solutions and electrolyte control for the Disc Record Plating Department. Also included are experiments regarding attempts to improve the plating process by increasing the speed, substituting different types of plating, and casting a wax or plaster backing (instead of copper) for the thin nickel face plated from the master. The books contain some work on experimental disc composition by Detlef. Notations in two books indicate that Detlef was reporting directly to Edison.
Portions of the first book have been selected as a representative sample.