The biographical materials include curricula vitae, clippings (primarily about his research, although there are several articles describing Cashman's work in the development of related fields), and programs of meetings at which he spoke. The education files consist primarily of Cashman's notes on lectures and reading, and laboratory experiments. The general correspondence concerns teaching, research, and other professional matters; there is little personal correspondence. Of interest is a small collection of letters related to Cashman's joint work with Walter S. Huxford on a "sunburnometer." The teaching files include lecture notes, problems, grade and registration records, examination sheets, and some student subject guides. The research and consulting files occupy nine boxes and form the largest category in the papers. The bulk of these materials consists of reports, correspondence, experimental data, and material relating to administrative matters. Some of the research topics include: photoelectric cells, thalofide cells, photoconductive cells. In addition to his research for the Navy, Army, Air Force, and the National Defense Research Committee, Cashman worked as a consultant for Capehart-Farnsworth Corp., General Electric Co., and the Research Corp. Four substantial folders of correspondence and patent materials concern Cashman's legal advisors, Mann and Brown. The documents in these files deal with infringements, potential infringements, and other procedures. Users interested in these aspects of Cashman's work should also consult specific patent records and pertinent periods of general correspondence. The collection also includes eleven of Cashman's laboratory notebooks. The publications contain drafts and reprints of some of Cashman's articles and related correspondence.