George III's pendulum
1762
1762
1762
1769
1755
1761
1761
1757
1762
1762
1762
1762
1752
1752
1762
1752
1762
1755
1764
1762
1762
1770
1755
2000-100 BCE
1758-1773
1758-1769
1758-1769
1760-1770
1758-1769
1705-1737
1762
before 1753
1752
1761
1752
1763
1752
1761-1762
1751
1752
1755-1765
1761
1760-1775
1761
1762
1752
1765
1762
1761
1770
1772 (original); 1919 (model)