Perspective drawing apparatus, incomplete, in integral mahogany case
1760-1770
1760-1770
1758-1773
1752
2000-100 BCE
1769
1755
1758-1769
1761
1761
1757
1762
1758-1769
1762
1762
1762
1752
1752
1762
1762
1755
1758-1769
1764
1762
1762
1770
1755
1762
1762
1990-96
1770
1758-1773
before 1753
1751
1771
1761
1772-1773
1772 (original); 1919 (model)
1769
1761
1705-1737
1762
1752
1758-1769
1761
1758-1769
1752
1763
1752
1761-1762
1752