Author and physicist. Correspondence, diary, writings, bibliography, notes, notebooks, biographical material, awards, photographs, newspaper clippings, printed matter, and other material relating chiefly to Coblentz's work in the fields of infrared spectroscopy and to the application of radiometry to astronomical problems.

Radio engineer and inventor. Correspondence and other papers relating to Friis's work on radio transmission, radio astronomy, and microwaves.

Electrical engineer and radio astronomer. Scientific notebooks, biographical material, correspondence, topical files, writings, printed matter, scrapbooks, photographs, and miscellaneous material documenting Mayer's career with the Naval Reseach Laboratory during which he improved radio telescope technology and measured the surface temperatures of Venus and other planets.