This folder contains undated notes and drawings, probably from the period 1899- 1910. Included are items by Edison regarding storage batteries and the layout of a battery manufacturing plant. Also included are a group of drawings by Edison, found with the label \"magnetometer descriptions\""; an unfinished draft of a patent application for molded disc records; and a lengthy set of draft specifications and calculations by an unidentified employee.

Approximately 40 percent of the documents have been selected. The items not selected consist of material by experimenters other than Edison.