
Bain's chemical telegraph, 1850.
1850
1850
1851
1851
1853
1849
1855
1854
1853
1850
1852
circa 1854
1850
circa 1854
1849
1850
1851
1955; 1830
1849
1854
1893-4
1851
1852
1849
1848
2000-100 BCE
1855
1855
1848-1852
1934
1851
1863-7
1855
1852
1855
circa 1854
1772 (original); 1919 (model)
1851
1849
1849
1990-96
1853
circa 1850s
1855
1801-1840 (original); 1901 (model)
1855
1830 (original); 1967 (model)
1839 (original); circa 1988 (replica)
1851
1775-1799 (original); 1900-1907 (model)
1850