Wet and dry bulb psychrometer for humidity measurement
1960-1970
1960-1970
1926-1932
1959
1950-1953
1940
2010
1890
1960-1970
1925
1925
2010
1997
2010
1997
1986
1695-1705
1998
1998
1955-1965
1914
1893
1944
mid-1800s
1876-1884
1815-1841
1643
1914
1900-1908
1940-1950
1964
1899
1794
1695-1705
1986
1915
1930-1950
1975
1891-1890
1986
1780-1800
[1965]
1923
1944
1970