
Rotative Steam Engine by Boulton and Watt, 1788
1788
1788
1785
1796-1798
1794
1787
hallmarked 1788
1799
circa 1800
1785-1790
1784
1798
1784
1797
1791
1786
1800
1787
1790
1796
1800
1800
1794
1800
1800
1792
1795
1800
1790
1795
1795
1790
1785-1795
1792
1790
1785
1785
1796-1797
1785-1789
1795
1792
1785-1795
2000-100 BCE
1790
1785
1792
1990-96
1791-1792
1799
1775-1799 (original); 1900-1907 (model)
1787