
Cooke and Wheatstone's four needle telegraph, 1838
1838
1838
1838
1839
1839
1838
1955; 1830
1893-4
2000-100 BCE
1934
1863-7
1838
1839
1772 (original); 1919 (model)
1839
1839
1839
1990-96
1830 (original); 1967 (model)
1839 (original); circa 1988 (replica)
1775-1799 (original); 1900-1907 (model)
4000-2001 BCE
1930 (replica); 1834 (original)
1705-1737
1838
1870-1877
1834-1836
1839
1889-02
1839
1838
1838
1838
1839
1839
1838
1774; 1923
1642-1649 (original); 1883 (model)
1839
2000-100 BCE
1883-01
30
1-79 CE; before 1914
1839
1824 (original); 1891 (model)
1991-1783 BCE
5000-500 BCE
1894-05
1867-04
1864-05
1864-04