
Rotative Steam Engine by Boulton and Watt, 1788
1788
1788
1783
1785
1785
1794
1787
hallmarked 1788
circa 1800
1785-1789
1785-1790
1784
1798
1784
1785
1799
1796-1797
1796-1798
1797
1791
1786
1800
1787
1790
1796
1800
1800
1794
1800
1783-1800
1800
1792
1795
1795
1800
1790
1795
1795
1790
1792
1785-1795
1792
1790
1785-1795
2000-100 BCE
1790
1790
1785
1772 (original); 1919 (model)
1792
1990-96