This pocket notebook consists of a diary for 1902. It was used by Edison during October 1903, September-November 1905, January 1906, and possibly at other times for notes and drawings regarding experimental work and other tasks to be performed at the laboratory. There are numerous proposed experiments relating to the chemical composition of components for Edison's alkaline storage battery, along with others pertaining to the location, assay, refinement, and use of nickel and cobalt ores. Some of the entries identify various groups of test cells, while others list experiments involving ores from the Darby mine in the Sudbury region of Ontario. There are also entries concerning phonographs, electromotographs, and operations at the Edison Portland Cement Co. plant. Among the many employees mentioned in relation to individual tasks are Jonas Walter Aylsworth, Emil Herter, Walter E. Holland, Walter S. Mallory, and Peter Weber. In addition, there are some entries pertaining to business, clerical, and family matters. These include one note about sending money to the Edison children for Christmas and reminders about communications with Sigmund Bergmann, Frank L. Dyer, and William E. Gilmore. The front cover is stamped "Thomas A. Edison." Approximately 80 pages have been used.