This undated manuscript by Edison was probably written in 1893. It provides a detailed account of his geological surveys and magnetic ore separation operations near Ogdensburg, N.J. during the period 1889-1892. The manuscript contains 39 pages, although they are numbered 1-33. The first five pages are torn and have been repaired.

Reprinted with permission from ASM International, Materials Park, OH 44073-0002. permission from ASM International, Materials Park, OH 44073-0002