This folder contains administrative and experimental records relating to Edison's principal research facilities in West Orange, New Jersey. Among the items for 1919 are six pages of notes made by representatives of the United States Radium Corp. (then known as Radium Luminous Material Corp.), whose luminous paint would eventually result in the deaths of several "radium girls" who worked at their factory in Orange. Also included is a questionnaire from the S. S. White Dental Manufacturing Co. about working hours of research and clerical staff, with answers by Edison and his assistant William H. Meadowcroft. In addition, there are notes by Harold N. Cox on errors in electrical capacity tests on iron and nickel mixes and by John V. Miller on experimental preparations of nickel hydrate, along with a communication pertaining to M. Arthur Wolf's recording experiments at the Columbia Street Studio.
Approximately 50 percent of the documents have been selected. The unselected material includes internal notes and communications about signs, forms, books, filing, expenses, and buildings; and letters of transmittal without their attachments. Also not selected are items referring to blueprints showing the electrical cable between the laboratory and Glenmont, Edison's home in nearby Llewellyn Park. Courtesy of Thomas Edison National Historical Park.