Correspondence, autobiographical material, personal and research diaries, bibliography cards, writings and lectures, student theses, newspaper clippings, charts, slides, photos, and other papers. Includes research information relating to antennae models, cables, millimeter waves and ultrahigh frequencies, photoelectric studies, velocity selectors, and zetetics, and material concerning Jews living in Europe and Palestine, and immigration before and after World War II. Also includes a motion picture film (neg. 33 mm.) on Tykociner's sound on film demonstration (1921-1922).