
Bain's chemical telegraph, 1850.
1850
1850
1775-1799 (original); 1900-1907 (model)
1839 (original); circa 1988 (replica)
circa 1848
1850
1851
1851
1850
1849
1934
1853
1849
1854
1850
1848
1848-1852
1893-4
1863-7
1851
1852
1849
2000-100 BCE
1853
1852
circa 1854
circa 1854
1955; 1830
1849
1854
1851
1851
1850
1852
1849
1849
1990-96
1853
circa 1850
1854
1934
1801-1840 (original); 1901 (model)
1849
1705-1737
1870-1877
4000-2001 BCE
1830 (original); 1967 (model)
1851
1930 (replica); 1834 (original)
circa 1850s
circa 1854