This notebook covers the period December 1882-May 1885. The entries are by John Ott, E. D. Kellogg, and H. de C. Hamilton. There is also one entry by Edison on carbon filament experiments. The name of Martin Force appears as a witness. Included are notes by Ott on experiments with carbon filaments, clamps, vacuum pumps, and electric meters. There are also notes by Kellogg and Hamilton on insulation experiments and notes by Hamilton on condensers, storage batteries, chemically treated wrapping paper, and bleaching by electricity. The label on the front cover is marked "Sept 4 80." The book contains 264 numbered pages. The last few pages have been torn out of the book.

Blank pages: 182-183, 190-264.