This notebook covers the period April-May 1901. All entries are by Edison. The book contains notes and drawings regarding thermocouple experiments. A few entries pertain to phonographs and to drilling technology, probably for Edison's ore milling or cement operations. Also included is a draft of a lecture on alkaline storage batteries, prepared by Edison for presentation by Arthur E. Kennelly to the American Institute of Electrical Engineers ("The New Edison Storage Battery," AIEE Transactions 18 (1901): 219-30). The pages are unnumbered, and the book has been used in both directions. Approximately 90 pages have been used.