This notebook was used by Edison during June-July 1916 for notes on experiments to improve the surface quality and the durability of disc records. There are also notes by Archie D. Hoffman and other experimenters, probably including Sherwood T. (Sam) Moore. The entries pertain primarily to experiments 1189E through1238E. Included are tests involving different presses and varnish compounds, variations in the methods of applying the varnish, and differing amounts of pressure and baking schedules. Also included are tests with a new "square edge" or "square ring" mold. Additional entries relate to diamond reproducer points and the amount of labor required in varnishing. At the end of the book are notes on the number of "girls" employed in the manufacture of records, as well as notes about piece work rates, inspection standards, the number of records produced, and the results of "drop tests." Some notes are in the form of instructions to Hoffman. Inserted into the book is one loose note by Edison regarding the reexamination of experiment 1143 in November 1916. The front and back covers are labeled "16." The pages are unnumbered. Approximately 140 pages have been used. Courtesy of Thomas Edison National Historical Park.