
Bain's chemical telegraph, 1850.
1850
1850
1839 (original); circa 1988 (replica)
1775-1799 (original); 1900-1907 (model)
1850
1851
1851
1850
1849
1893-4
1934
1849
1955; 1830
1850
1849
1851
1863-7
1851
1849
2000-100 BCE
1851
1850
1849
1849
1990-96
1772 (original); 1919 (model)
1851
circa 1850
1934
1801-1840 (original); 1901 (model)
1851
1930 (replica); 1834 (original)
circa 1850s
1850
1849
1705-1737
1850
1851
1870-1877
4000-2001 BCE
1830 (original); 1967 (model)
1849
1668; 1924
1990-95
1642-1649 (original); 1883 (model)
1610; 1923
2050-1750 BCE
1834-1836
1960-1979
1600-1500 BCE (original); 1900-1914 (copy)
700 BCE; 1931