PN-Undated.19 (ca. 1904-1910)
This undated pocket notebook was probably used by Edison during the early 1900s. Included are notes about two chemical experiments, one involving rosin oil and lime and the other glycerine and other compounds. Also included are a drawing and some miscellaneous calculations. The cover is stamped \"Memorandum.\"" The pages are unnumbered. Only 9 pages have been used."