
Rotative Steam Engine by Boulton and Watt, 1788
1788
1788
1783
1785
1785
1782
1787
hallmarked 1788
1785-1789
1785-1790
1784
1784
1785
1786
1787
1790
1780
1790
1790
1790
1781-1790
2000-100 BCE
1790
1790
1785
1772 (original); 1919 (model)
1990-96
circa 1780
1784
1784
1783
1784
1787
1783
1785
1780
1705-1737
1788
1784
1785
1785
1787
1780
4000-2001 BCE
1783-1787
1780-1790
1784
1774; 1923
1642-1649 (original); 1883 (model)
1782
2000-100 BCE