Perspective drawing apparatus, incomplete, in integral mahogany case
1760-1770
1760-1770
1769
1762
1762
1770
1762
1762
1761
1762
1762
1762
1762
1762
2000-100 BCE
1761
1762
1764
1770
1990-96
1760-1772
1771
1775
1705-1737
1760-1775
1765
1772 (original); 1919 (model)
1769
1775
1760-1775 probable date
4000-2001 BCE
1760
1772-1773
1761
1762
1761
1761-1762
1763
1761
1762
1762
1761
1761
1761
1761
1769
1773
1774
1770
1762
1730; 1967