Napier's Bones
1690
1690
1610; 1923
1681
1675-1679
1990-96
1673
1668-1672 Probable
1680
1672
1675-1685
1685-1695
4000-2001 BCE
2000-100 BCE
1685-1695
1675-1685
1666-1680
1680-1690
1685
1675-1685
1675-1685
1692
1680-1690
1680
1680-1685
1675
1685
1675
1680
1670-1680
1690
1690
1680
1680
1670
1670
1666
1690-1695
1675
1670
1670
1670-1680
1690
1671
1668; 1924
1990-95
1642-1649 (original); 1883 (model)
1667
1666
1666-1667
1936