The Thomas A. Edison Papers Digital Edition

This notebook, which covers the period April 1892-February 1893, is a continuation of N-92-03-19. It was used by Edison and an unidentified author primarily for notes from experiments on reducing phosphorous. The tests are numbered 153-158. Test numbers 157 and 158 are complemented by two letters from Booth, Garrett & Blair, analytical chemists. An incomplete, inserted note by Edison regarding phosphorous tests is followed by a complete, variant version in another hand under the title, "Experiments made by Mr. Edison for the removal of Phosphorus from magnetic concentrates." The book also includes two tests for the gold properties of arsenical pyrites. The front cover is labeled "Mr. Edison's Phosphorous Expts #2." The spine is labeled "Mr. Edisons notes." The pages are unnumbered. Approximately 25 pages have been used. Thirteen loose pages have been inserted into the book.