This notebook covers the period February-May 1891. There is also one entry from February 1890. It was used by one or more unidentified experimenters for notes and calculations regarding ore separation and assays, chemical analyses of stearic acid, experiments with chlorine, and tests of lubrication for a small motor. The front cover is labeled "594." The spine is labeled "108." The book contains 93 numbered pages, beginning with page 101; the first 100 pages have been removed from the book.

Only the material relating to ore separation and lubrication experiments has been selected.