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