
Bain's chemical telegraph, 1850.
1850
1850
1849
1830 (original); 1967 (model)
1934
1850
1848
1850
1849
1852
1848-1852
1851
1863-7
1851
1852
1849
1893-4
2000-100 BCE
1851
1955; 1830
1852
circa 1850s
1934
circa 1850
circa 1848
1839 (original); circa 1988 (replica)
1850
1705-1737
1850
1850
1851
4000-2001 BCE
1870-1877
1851
1930 (replica); 1834 (original)
1668; 1924
1990-95
1610; 1923
1642-1649 (original); 1883 (model)
1936
1834-1836
circa 1850
1851
1849
1849
circa 3000 BCE
1849
1850
1851
1851
1848