This folder contains carbon copies of ongoing correspondence similar (and, in many cases, identical) to the items found in the Letterbook Series. The letters, which were originally fastened together in a two-ring binder, are primarily by Edison and his personal assistant, William H. Meadowcroft. Among the documents for 1915 are letters concerning employment searches, including the draftsman and organic chemist positions at the West Orange laboratory. There are also items pertaining to toluol production and Edison's interest in evaporating equipment, as well as correspondence regarding the scheduling of trial record appointments. A letter to Robert Work of Swarthmore Prep School indicates that Edison considered his incandescent electric light system to be his "biggest" invention.
Approximately 20 percent of the documents have been selected. The material not selected consists of duplicates, letters of transmittal and acknowledgment, and other routine correspondence. Courtesy of Thomas Edison National Historical Park.