
Rotative Steam Engine by Boulton and Watt, 1788
1788
1788
1791
1794
circa 1800
1798
1797
1791
1800
1790
1796
1800
1794
1800
1800
1800
1792
1795
1800
1790
1802
1795
1795
1790
1792
1802
1790
1799-1802
1797-1804
1793-1803
hallmarked 1788
1799
1893-4
1795
1792
2000-100 BCE
1796-1798
1796-1797
1802
1790
1990-96
mid-1800s
1705-1737
1800
1788
1791
1790-1794
1804
1799
1795
1800