November 5, 1950 letter from Susan R. Chapin to Wilburt Davison thanking him for a copy of his "Thumbnail Sketch" and "Reminisces" of Sir William and Lady Grace Osler.
Kymograph. Electric. 1950s. Brass drums mounted on teak base. Instrument used to measure and graphically record physiological responses: blood pressure, pulse, respiration, muscle contraction, nerve impulses, etc.