
Insulators used for Morse's telegraph, 1835
1835
1835
1835
1838
1835-1840
1840
4000-2001 BCE
1840
1833
1930 (replica); 1834 (original)
1705-1737
1837
1842
1839-1840
1840
1870-1877
1837
circa 1840
circa 1842
1642-1649 (original); 1883 (model)
1990-95
1668; 1924
1840
1840
1610; 1923
1834-1837
1976; 1776
1834-1836
1701-1800
1929 (copy); 1702-1714 (original)
300 BCE; 1905-1915
1834
1833
1839-10-29
1842
circa 1841
circa 1840
circa 1840
1841-1843
1839
1889-02
1839
1838
1838
1838
1841
1839
1836-1839
circa 1843
1837
1835