
Lenses from the Finsen lamp
1890-1900
1890-1900
1900-1950
1971
1945-1955
1897
1920-1930
circa 1900-20
1870-1878
1980-1982
1979
1955-1960
1977
1960
1936-1985
2006
1998
1967
1801-1822
1888
1893
c1850
circa 1890
1950-1970
1895
1921
1913-1914
1914
1954
1937
1955
1977
1900
2020
c1900
c1870
1922
1940
1850
1968
1930-1940
1895-1900