This undated notebook was probably used by Edison in 1907 or 1908, but it may have been used as late as 1910. The book contains notes and drawings regarding continuous-process belting, possibly related to the manufacturing process used by the Edison Portland Cement Co. Over half of the book consists of miscellaneous notes and drawings, probably by Edison's youngest son, Theodore. The pages are unnumbered. Approximately 30 pages have been used.
Courtesy of Thomas Edison National Historical Park.