This notebook covers the period January-February 1893. It was used by Charles Batchelor and Edison primarily for notes, drawings, and calculations from 63 numbered experiments on the magnetic separation process. Notes on experiment 62 are by Walter S. Mallory. The series is followed by drawings, notes, and measurements from a "Duster experiment" and an unnumbered "Concentrate Seperator Experiment." An unidentified graph is inserted near the end of the book. The pages are unnumbered, and the book has been used in both directions. Approximately 140 pages have been used. Courtesy of Thomas Edison National Historical Park.