
Bain's chemical telegraph, 1850.
1850
1850
1851
1851
1850
1850
1850
1851
1955; 1830
1893-4
1851
1934
1863-7
1851
2000-100 BCE
1772 (original); 1919 (model)
1851
1990-96
circa 1850s
1801-1840 (original); 1901 (model)
1775-1799 (original); 1900-1907 (model)
1830 (original); 1967 (model)
1839 (original); circa 1988 (replica)
1851
1850
1930 (replica); 1834 (original)
circa 1850
1705-1737
1850
1934
1850
1851
1870-1877
4000-2001 BCE
1834-1836
1807 - 1904
1850
circa 1850
1889-02
1851
circa 1850
1850-1899
1774; 1923
1850
1851
1850
1642-1649 (original); 1883 (model)
2000-100 BCE
1851
1851
1851