Lens from prototype Cox selenium-cell magnifier equipment, 1910-1920
1910-1920
1910-1920
1896
circa 1922
circa 1982
circa 1840
1858
1981-1990
circa 1840
circa 1900
circa 1885
1950s
circa 1887
circa 1900
circa 1912
circa 1930
circa 1912
1927-1937
circa 1910
1942
circa 1908
circa 1925
1960s
circa 1929
circa 1922
circa 1910
circa 1901
circa 1910
c.1910
circa 1908
circa 1948
circa 1924
circa 1926
circa 1924
circa 1910
circa 1880
1915-1925
1950s
circa 1890
circa 1930