This notebook covers the periods January 1899 and January 1903. All entries are by Edison. The book has been used in both directions. At one end are notes and drawings from 1899 regarding electric meters. At the other end are entries from 1903 that appear to be preliminary drawings for patent applications pertaining to the projecting kinetoscope and to storage batteries for use at central stations. There are also some notes relating to mica deposits in the United States and Canada. The pages are unnumbered. Approximately 80 pages have been used.