Wet and dry bulb psychrometer for humidity measurement
1960-1970
1960-1970
1860
1926-1932
1959
1950-1953
1940
1895-1905
2010
1944
2022
2022
2010
About 1890
2016
1890
2022
2023
1960-1970
before 1889
2010
1901-1911
1925
860-825 BCE
1800-1872
2021
2013
1990-1991
2022
2014
1925
2010
before 1889
2014
1997
About 1970
before 1889
1986
1997
1993
1995
1998
2022
1923
1957
2021
About 2009
1893
1980s
1998
1993