Thermometer dividing engine, London, England, 1925-1940
1925-1940
Equipment used for calibrating clinical thermometers, 1925-1940, with collection of thermometers made on it by F. W. Johnston and Daughter, Hendon 1930-1975
1925-1940
1950-1978
1950-1978
1950-1978
1950-1978
1950-1978
1950-1978
1950-1978