
Octant made of ebony and brass
1830-1835
1830-1835
circa 1808
after 1859
1790-1819
1790-1819
1790-1819
1808
1790-1819
1790-1819
1850
1830 (original); 1967 (model)
before 1857
1794
circa 1780
1806
1799
1830
1775-1799 (original); 1900-1907 (model)
c1860
1787
1800-1818
1800-1818
1800-1818
1780
1858
1835
1850
1835
1838
1835-1840
1840
1775-1785
1783-1787
1785-1795
1795-1805
1800-1830
1801-1850
1801-1830
1801-1830
1801-1830
1801-1830
1780-1820
1801-1830
1801-1830
1840-1860
1830-1850
1780-1860
1846-1855
1801-1830
1808-1840