Perspective drawing apparatus, incomplete, in integral mahogany case
1760-1770
1760-1770
1761
1762
1762
1778
1762
1764
1762
1762
1769
2000-100 BCE
1761
1776
1762
1762
1762
1778
1762
1762
1770
1758-1773
1758-1769
1758-1769
1758-1769
1770
1990-96
1771
1775
1761
1761
1761
1761
1705-1737
1762
1761
1763
1761-1762
1760-1775
1762
1765
1762
1772 (original); 1919 (model)
4000-2001 BCE
1760-1772
1769
1775
1760-1775 probable date
1761
1761
1758-1769