
Model, of blade from Crispin's patent 1860 screw propellor
1861
1861
1890
1897
1888
1897-1933
1926
1894
1861
1861
1905
1904
1938
1897
1919
1926
1922
1911
1884
1866
1903
1914/09
1835-1880
1887
1939
1912
1914
1952
1859
1857
1925-07-04
1926-03-29
1896
1904-1923
1919
07 June 1955
1861
1876
1921
1921
1892
1866
1901
1864
1951