This undated notebook was probably used sometime during the period 1901-1903, although it may have been used as early as 1900. All entries are by Edison. The book contains notes and drawings regarding ore surveys, assays, and ore separation experiments. Included are entries pertaining to the search for nickel and cobalt in the Sudbury district of Ontario, Canada, and in Litchfield County, Connecticut, for use in Edison's storage battery. Other items relate to separation tests on iron ore from the Dunderland region of Norway. The pages are unnumbered. Approximately 20 pages have been used.
Courtesy of Thomas Edison National Historical Park.