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