
Difference Engine No. 1
circa 1832
circa 1832
1835
1838
1775-1799 (original); 1900-1907 (model)
1839 (original); circa 1988 (replica)
1840
1837
1837
circa 1840
1842
1845
1842
1934
1840
1837
1845
1840
1845
1834
1834
1835
1834
1832
1842
1837
1833
1842
1837
1839
1841
1834-1844
1837
1839
1843
1955; 1830
1837
1831
1841
1893-4
1838
1844
1844
1835-1845
1863-7
2000-100 BCE
1831
1836
1840-1845
1838
1838