This folder contains copies of outgoing correspondence similar to the material found in the Letterbook Series. Most of the letters cover the period January-March 1893 and pertain to the kinetograph, the phonograph, the phonoplex, the electric railway, and other technical and business interests. There are also some items concerning Edison's personal affairs. Most of the correspondence is by Alfred O. Tate, acting as Edison's private secretary or as vice president of the North American Phonograph Co. Unsigned letters have been attributed to Edison, Tate, or Thomas Maguire (Tate's secretary), depending on their content.

Approximately 40 percent of the documents have been selected. The following categories of documents have not been selected: routine correspondence regarding shipments, orders, financial transactions, stock transfers, and employment applications; routine responses to individuals requesting or offering advice or making other unsolicited inquiries; duplicate copies of selected items; documents that duplicate information in selected material.