
Difference Engine No. 1
circa 1832
circa 1832
1838
1839 (original); circa 1988 (replica)
1834-1836
1837
1837
1842
circa 1840
1830-1840
1834
1832
1845
1842
1825
1842
1837
1840
1826
1845
1834
1834
1845
1829
1837
1830
1840
1835
1834-1844
1837
1842
1838
1841
1839
1840-1845
1837
1831
1839
1955; 1830
1844
1934
1844
1837
1843
1826
1825-1835
1835
1841
1893-4
1838
1835-1845