These twelve notebooks were used by Ludwig F. (Louis) Ott during 1911-1924 for notes on chemical experiments performed for Edison and others. Many of the experiments pertain to batteries, including the recovery of nickel flake and nickel oxide from old battery cells and chemical work on the electrolyte. Another large group of experiments relates to the development and improvement of phonograph records. There are entries on Condensite and paraphenylenediamine for disc and cylinder records, on plating solutions, and on chemical tests of Victor records to determine their composition. The notes also describe experiments on fireproof fabric, dust-laying compounds, and motion picture film. Some of the books contain notations by Edison.