This notebook was used by Edison during September-December 1916 for notes on experiments to improve the manufacture of disc records. There are also notes by William Walter Dinwiddie, Archie D. Hoffman, and other experimenters. The entries describe a sequence of experiments numbered from 1308E through 1388E. Included are tests of experimental lots of record blanks constructed by different methods or prepared with different ingredients. Some tests involve variations in the varnish preparations used to coat the record blanks or in their method of application. Flaws and successful results are both noted. One notation indicates that the results of experiment 1381E were reinspected in January 1917. At the end of the book are tallies of record blanks produced. Some notes are the form of instructions to Hoffman or Dinwiddie. The front and back covers are labeled "19." The pages are unnumbered. Approximately 150 pages have been used. Courtesy of Thomas Edison National Historical Park.