This notebook was used by William Walter Dinwiddie during April-July 1918 for notes relating to the production of the blanks and submasters used in the manufacture of disc records. Edison's supervision of this work is indicated by Dinwiddie's references to his suggestions and by lists of chemicals referred to as "Mr. Edison's." The experiments are numbered from D1 through D100. The entries indicate differing methods of preparation involving variations in the baking schedules and the use of different ingredients, combinations of ingredients, and varnishes. Most entries contain comments about the results of the experiments, including whether the disk was cracked, rough, too stiff, or stuck to plates and molds during printing process. Also included are references to varnish experiments and to "drop tests" that were performed to determine the durability of the experimental blanks and submasters. There are occasional lists of chemicals ("materials obtained in N.Y."), along with notations regarding their characteristics and sources of supply. The notes indicate that Frank Clancy, Charles T. Dally, Charles G. Kircher, and Ludwig F. (Louis) Ott worked with Dinwiddie on these or related experiments. The front cover is labeled "Dinwiddie D-1 -- 100" and "Disc Records." The pages are unnumbered. Approximately 110 pages have been used. Courtesy of Thomas Edison National Historical Park.