This undated notebook is a continuation of N-01-04-15. It contains notes by Edison and an unidentified experimenter regarding trials of various alloys for use in thermocouples. The metals tested include bismuth, cadmium, lead, and tin. At the beginning of the first entry Edison wrote,"Thermo 2nd Book." The spine is stamped "153." The pages are unnumbered. Approximately 20 pages have been used.