The Thomas A. Edison Papers Digital Edition

This undated notebook was used by Edison, probably during February 1916, for notes on the composition and application of varnish surfaces used for disc records. Included are notes describing a sequence of experiments numbered from 272E to 365E; some entries have been crossed out or marked "cancelled." Most of the entries indicate results obtained from varying the ingredients and proportions in the varnish applied, as well as varying the processes for baking and the schedules for the application of the transfer press. The summary of results usually provides a tally of acceptable and unacceptable record surfaces obtained. Also included are notes relating to attempts to remove wrinkles on surfaces. Some notes are the form of instructions to Sherwood T. (Sam) Moore, Archie D. Hoffman, or other employees. Inserted into the book is one loose item by Edison, which tabulates some of the results. The front cover is labeled "Disc 6." The pages are unnumbered. Approximately 160 pages have been used.