Part Of: Notebook Series -- Notebooks by Edison

[NA250-F] N-14-06-13.2 (1914)

This notebook was used by Edison and an unidentified employee during June 1914. It contains notes on the process of forming disc record blanks. Entries by the unidentified employee at the beginning of the book provide a daily record of observations from June 3 to June 26 concerning "new process Blank machines" for the production of disc record blanks. The daily record includes information about problems with machines, the number of blanks produced, and the number of men working on various parts of the production process. The following entries, which are by Edison, pertain to experiments made with one of the loading and pressing machines to determine how to apply even pressure on the powder (used to form blanks) with a rubber plunger. Included are notes on the timing, the pressure applied, and changes in various equipment, such as scrapers and planers. There are also notes on problems with the powder and the varnishes used to coat the blanks. At the end of the book are several pages of drawings and rough calculations that relate mainly to the layout of a manufacturing department for the production of disc record blanks. The front cover is labeled "Disc Record." The pages are unnumbered. Approximately 50 pages have been used.

Courtesy of Thomas Edison National Historical Park.

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