Lens from prototype Cox selenium-cell magnifier equipment, 1910-1920
1910-1920
1910-1920
1858
circa 1982
circa 1922
circa 1840
1896
circa 1840
1981-1990
circa 1900
circa 1885
circa 1887
circa 1900
1950s
circa 1930
circa 1912
circa 1910
circa 1912
circa 1929
1960s
1927-1937
circa 1908
circa 1901
1942
circa 1925
circa 1910
circa 1922
circa 1910
c.1910
circa 1908
circa 1910
circa 1948
circa 1926
1915-1925
circa 1890
circa 1930
1940-1945
circa 1924
1790-1819