
Rotative Steam Engine by Boulton and Watt, 1788
1788
1788
1787
1796
1775-1799 (original); 1900-1907 (model)
1789-1795
1794
1787
hallmarked 1788
circa 1800
1796-1797
1796-1798
1792
1798
1797
1791
1800
1790
1800
1800
1794
1800
1800
1792
1795
1795
1800
1790
1795
1795
1790
1792
1790
2000-100 BCE
1799
1790
1792
1990-96
1791-1792
1705-1737
1791
1800
1788
1791
1790-1794
1799
1795
1787
1800
1797
4000-2001 BCE