
Cooke and Wheatstone double needle telegraph, 1844
1844
1844
1837
1844
1860
1851
1852
1870-1877
1892
1849
1870-1880
1876
1880-1890
1872 (original); 1909 (model)
1835-1870
1875
1839-1887
1892
1862
1884
1855
1842
circa 1885
1870
1838
1854
1825-1879
1850-1856
1841
1839
1840-1845
1879
1837
1889
1845-1851
1846
1878-1890
1878-1890
1878-1890
1878-1890
1865
1858-03-02
1866
1890-1894
1878-1890
1878-1890
1889
1865
1867-1868
1849
1875