Cylindrical Type Actinograph Exposure Calculator
circa 1888
circa 1888
1933
circa 1945
circa 1945
1960-1965
1924
1939
1921
1939
1907
1939-1941
1919
1920-1930
1955
1942
1930
1926-1936
1933
1942
1926
1910
1924
1942