
Rotative Steam Engine by Boulton and Watt, 1788
1788
1788
1783
1785
1785
1794
1782
1787
hallmarked 1788
1785-1789
1782-1793
1785-1790
1784
1784
1785
1796-1797
1797
1791
1786
1787
1790
1796
1794
1780
1792
1795
1795
1790
1795
1795
1790
1792
1785-1795
1792
1790
1785-1795
1781-1790
2000-100 BCE
1790
1790
1785
1772 (original); 1919 (model)
1792
1990-96
1791-1792
circa 1795
1794
circa 1780
1784
1784
1783