This notebook covers the period November 1873-December 1877. Most of the laboratory notes and drawings are by Charles Batchelor; a few are by Edison. The material relates primarily to batteries, induction coils, and telegraphy. There is also a list of basic scientific questions, ranging from Newton's law of gravitation to atomic theory. The book also contains numerous accounts and lists of prices, stock, and hours worked. The flyleaf is labeled "Experimental Researches." The book contains 74 numbered pages, followed by 11 unnumbered leaves. Some leaves have been torn out.
Blank pages: 18-19, 24-25, 34-49, 52-53, 56-57, 60-69, 72-73.
Missing pages: 27-28. 306. Courtesy of Thomas Edison National Historical Park.