Demainbray's Newcomen engine model
1720
1720
1700-1752
1735-1752
1939
1752
1821
1807-1820
1930-1980
1802
1698-1744
1910
1939
1912
1911
1939
1905-1915
1939
circa 1938
1888
1930s
c1908
1808-1860
1943-1980
1754
1890
1870-1900
1907-1917
1930
1955
1910
1950
1955
1955
1955
1955
1950
1950
1947
1939
1955
1955
1955
1910