Physical chemists. Writings, speeches, correspondence, research data, subject files, photographs, notes, and miscellaneous textual materials in both physical and digital formats primarily relating to the Karles’ careers at the Naval Research Laboratory and their contributions to the field of crystallography.

Chemist. Correspondence, diaries, experimental notebooks, writings, printed matter, and miscellaneous material containing data that led to scientific developments such as the gas-filled incandescent lamp, the high vacuum power tube, atomic hydrogen welding, and screening smoke generators for the armed forces. Includes material on cloud seeding experiments and smoked bathythermograph records obtained at Lake George, N.Y. Also includes material relating to Langmuir’s student years.