Engravings of colour sketches showing solar prominences by Etienne Leopold Trouvelot
1872
1872
1870
1875
1872
1871
1870-1872
1936
1886
1898
1872
1883
1893
1916-05
1936
1885
1893
1889
1936
1878
1869
1869
1869
1916; 1929
1869
1869
1916
1916
1872
1905
1908
1929
1926
1900
1926
1905
1895
1898
1895
1898
1936
1927
1936
1895
1928
1927
1901