Scope and Content Note
The papers of Harald Trap Friis (1893-1976) span the years 1921-1976. The papers are in English and Danish and are organized alphabetically by type of material and by subject matter with a miscellany at the end composed of awards, photographs, scrapbooks and printed matter.
After studying in Denmark and at Columbia University, Friis spent his career at Bell Telephone Laboratories as a researcher in various aspects of radio engineering. The papers relate to his work in radio transmission, signal to noise ratio, radio astronomy, antennas, and microwave transmission and equipment. Included are correspondence, notes, diagrams, patents, writings, scrapbooks, printed matter, photographs, and material for the writing of his 1971 memoir Seventy-Five Years in an Exciting World. The photograph album from Bell Telephone Laboratories covers his long career with that company. Photographs document radio equipment, antenna designs including large antennas for radio astronomy, his co-workers, and the Holmdel laboratory facility.