Decoudun photometer
1800-1950
1800-1950
1889
1896
1913
1879
1895-1905
1800-1950
1800-1950
1800-1950
1850-1950
1800-1950
1800-1950
1800-1950
1800-1950
1850-1950
1800-1950
1800-1950
1800-1950
1800-1950
1800-1950
1800-1950
1800-1950
1800-1950
1800-1950
1900-1950
1954
1930
1904
1930
1800-1950
1894
circa 1914
circa 1914; 1985
1925-1935
1885
1890
1901
1880
circa 1910
1887
1953
1880
1891
1892