This folder contains documents relating to x-rays, radiation, and other physical phenomena. The selected items for 1917 consist of an inquiry from business associate Theron I. Crane regarding the use of a special ray to produce explosions, along with Edison's skeptical response.

Approximately 10 percent of the documents have been selected. Some of the other inquiries received a brief reply signed by the "Edison Laboratory," but none pertain to Edison personally.

Courtesy of Thomas Edison National Historical Park.