This folder contains correspondence and other documents relating to the business of the Edison Machine Works in New York City, which manufactured dynamos and large electric motors for the Edison electric light system. Much of the correspondence is by Charles L. Dean, superintendent of the machine works; by Charles Rocap, secretary; and by Gustav Soldan, Dean's successor as superintendent.

Approximately 70 percent of the documents have been selected. The following categories of documents have not been selected: weekly dynamo reports; weekly financial statements; orders; routine correspondence relating to shipping and supplies.