
Cooke and Wheatstone's four needle telegraph, 1838
1838
1838
1835
1838
1836
1837
1837
1837
1837
1838
1835
1837
1955; 1830
1893-4
1934
1837
1863-7
1837
2000-100 BCE
1838
1772 (original); 1919 (model)
1990-96
1775-1799 (original); 1900-1907 (model)
1830 (original); 1967 (model)
1930 (replica); 1834 (original)
1705-1737
1837
1835
1835
1838
1870-1877
1837
4000-2001 BCE
1834-1836
1889-02
1838
1838
1838
1850-1899
1837
1835
1838
1837
1774; 1923
1642-1649 (original); 1883 (model)
2000-100 BCE
1835
1883-01
1837
1835
30