
Wet and dry bulb psychrometer for humidity measurement
1960-1970
1960-1970
1705-1737
1945-1955
1925-1935
1920-1950
1915
1830 (original); 1967 (model)
1903 (original); 1982 (model)
1960
1930-1960
1990-96
1943
1914-1918
circa 1956
1954-1968
1964
1934-1935
1950
1938
1920
1947
1938
1948
1923-1948
1938
1969
1935
1950-1969
1938
1961
1940
circa 1955
1928
1950
1960
1955-1965
1922
1960
1960
1968
1932
1964
1955; 1830
1950
1965
1935
1955
1927-1929
1959
1914