Set of four photographs in window mounts showing an enlarged portions of the Sun's visible disc
1872-1884
1872-1884
1875
1883
1885
1893
1878
1893
1898
1926
1926
1871
1869
1869
1861
1861
1861
1936
1916; 1929
1880
1916-05
1878
1870
1869
1917
1872
1936
1872
1911
1860-1868
1872
1870-1872
1858-1861
1861
1861
1936
1916
1916
1878
1926
1889
1886
1926
1926
1869
1869
1878
1878
1917
1872