
Replica of Morse's second model of telegraphy apparatus, 1934
1934
1934
circa 1850
circa 1848
1846
circa 1840
1845
1839
1842
1841
1838
1839
1839 (original); circa 1988 (replica)
1850
1705-1737
1837
1850
1839-1840
1850
1837-1846
1840
1837
1840-1850
1851
1844
4000-2001 BCE
1840
1839
1845-1851
1842
1870-1877
1851
1838
circa 1842
1930 (replica); 1834 (original)
1668; 1924
1840
1990-95
1610; 1923
1642-1649 (original); 1883 (model)
1838-1848
1845-1847
1936
1834-1836
circa 1850
1840-1851
1842
1846-08
1851
circa 1846
circa 1840