
Bain's chemical telegraph, 1850.
1850
1850
1851
1852
2000-100 BCE
1854
1852
1842
1841
1850
circa 1850
1846
1840
1855
1855
1930 (replica); 1834 (original)
circa 1850s
1846
1990-96
1849
1849
1854
1851
circa 1840
1840-1850
1851
1844
1855
1845-1855
1830 (original); 1967 (model)
1851
1851
1849
circa 1848
1845
1772 (original); 1919 (model)
1934
1850
1845-1851
1870-1877
1705-1737
1775-1799 (original); 1900-1907 (model)
1801-1840 (original); 1901 (model)
1842
1850
1840
circa 1842
1846-1855
1847-1848
4000-2001 BCE
1840