Perspective drawing apparatus, incomplete, in integral mahogany case
1760-1770
1760-1770
1758-1773
2000-100 BCE
1769
1758-1769
1761
1761
1757
1762
1758-1769
1762
1762
1762
1762
1762
1758-1769
1764
1762
1762
1770
1762
1762
1990-96
1770
1758-1773
1771
1761
1772-1773
1772 (original); 1919 (model)
1775
1769
1761
1705-1737
1762
1758-1769
1761
1758-1769
1763
1761-1762
1760-1775
1761
1762
1761
1765
1762
1761
4000-2001 BCE
1761
1760-1772
1775