Watt's end measuring machine
1776
1776
1794
1785
circa 1800
1776-1780
1776-1780
1776-1780
1778
1785
1785
2000-100 BCE
1782-1793
1784
1778
1777-1785
1782
1787
hallmarked 1788
1799
1796-1797
1796-1798
1785-1789
1783
1784
1785-1790
1798
1797
1781-1790
1780-1800
1790
circa 1780
1775-1799 (original); 1900-1907 (model)
1797
1990-96
1788
1776-1780
1776-1780
1787
1783
1794
1799
1705-1737
1791
1785
1780
1772 (original); 1919 (model)
4000-2001 BCE
1792
1791-1792
1784