This pocket notebook was used by Edison, probably during 1909. It contains notes pertaining to finances, experimental work, book orders, and the supervision of employees. Included are calculations of cement production costs and projected profits from phonograph records, notations regarding accounts to be checked by Alphons Westee, and lists of patent questions to be asked of Frank L. Dyer. Also included are notes and drawings about battery experiments to be performed, including work on the composition and manufacture of components. Other experiments to be conducted relate to x-rays, motion picture film, phonograph reproducers, records and recording, phenolic resins, mechanical amplification, and tints and molds for concrete. Among the numerous employees mentioned in relation to individual experiments are Jonas Walter Aylsworth, Daniel Higham, Walter E. Holland, and John F. Ott. The pages are unnumbered. Approximately 110 pages have been used.