This notebook contains records of chemical experiments (some executed, some only proposed) relating to automatic telegraphy and batteries. The cover is marked "Experiments made by Chas. Batchelor" and the entries are in his hand. The only entry with a complete date is for November 27, 1873. Two loose leaves by Edison and Batchelor, written on the back of American Telegraph Works notepaper, have been inserted into the notebook. They contain notes on chemical experiments. Approximately 20 pages of this unnumbered book have been used. Courtesy of Thomas Edison National Historical Park.