
Rotative Steam Engine by Boulton and Watt, 1788
1788
1788
1785
1784
1794
1798
1797
1795
1785-1795
1785
1785
1785
1787
hallmarked 1788
1796-1797
1796-1798
1785-1789
1785-1790
1784
1784
1791
1786
1787
1790
1796
1794
1792
1795
1790
1795
1795
1790
1792
1792
1790
1785-1795
2000-100 BCE
1790
1990-96
1784
1784
1787
1797
1794
1785
1772 (original); 1919 (model)
1792
1791-1792
circa 1795
1785
1705-1737