![](https://coimages.sciencemuseumgroup.org.uk/74/259/large_thumbnail_1953_0353__0001_.jpg)
Stanhope square demonstrator, c.1805.
circa 1805
circa 1805
1808
1809
circa 1810
1806
1807
1815
1815
1802
1805
2000-100 BCE
1893-4
1808
1813
1863-7
1812
1815
1807
1990-96
1808
1811-1812
1805-1815
1815
1809
4000-2001 BCE
1806
1705-1737
1801
1801
circa 1810
1814
circa 1808
1804-1807
1805
1775-1799 (original); 1900-1907 (model)
1772 (original); 1919 (model)
1813
1801
1809
1805
1805-1806
1805
1808
1810
1807
1807
1807-1810
1812
1808
1810