This notebook was used by William Walter Dinwiddie in May and June 1914. At the beginning of the book are formulas for a silver solution, a reducing solution, and a washing solution; these formulas also appear in other books in this subgroup. Most of the entries describe experiments with "commercial" records or submasters washed with gold dust. The results and appearance are noted. There are occasional references to experiments by Moore, probably Sherwood T. (Sam) Moore. Also included is a list by Edison of suggested chemicals, with a notation that he will make additional suggestions if these do not work. The front cover is labeled "Silver Plating W. W. Dinwiddie May 1914." The book contains 28 numbered pages; some pages are blank.