This folder contains correspondence and other documents relating to the operation of the West Orange laboratory. Included are inquiries regarding materials and instruments, some in Edison's hand, as well as a statement of New Jersey taxes paid by the Ott Manufacturing Co. Also included is correspondence pertaining to the coal smoke generated by the West Orange complex, to compressed air experiments, and to Edison's interest in equipment and in real estate adjacent to the laboratory.

Approximately 30 percent of the documents have been selected. Among the items not selected are routine orders for chemicals, some in Edison's hand; perfunctory acknowledgments of orders placed with General Electric Co. and other companies; and samples of blank forms (e.g. letterhead, order forms, invoices) and stationery used at the laboratory.