Earth thermometer with bent stem, c. 1925.
1925
1925
1985
1943
1997
1985
1952
1880-1889
1985
1964
1985
1986
1966
1985
1985
1985
1985
1874
1874
1950-1959
1950-1959
1971
1966
1917
1874
1968
1960-1969
1943
1968
1925
1997
1972
1944
1964
1925