Wet and dry bulb psychrometer for humidity measurement
1960-1970
1960-1970
1926-1932
1959
1950-1953
1940
1944
2010
1890
1960-1970
2010
1925
1925
2010
1997
1997
1986
1998
1695-1705
1955-1965
1893
1998
1914
mid-1800s
1876-1884
1815-1841
1643
1914
1924
1940-1950
1900-1908
1964
1939
1915
1899
1695-1705
1986
1780-1800
1975
1930-1950
1794
1986
1891-1890
1986
1908