
Difference Engine No. 1
circa 1832
circa 1832
1835
1838
1840
1815-1825
1825-1835
1775-1799 (original); 1900-1907 (model)
1839 (original); circa 1988 (replica)
1830
1820
1821
1829
1840
1837
1837
1837
1820
1822-1840
circa 1840
1839
1821-1831
1955; 1830
1842
1842
1809
1835
1837
1834
1829
1832
1826
1831
1815
1815
1842
1810-1817
1841
1893-4
1838
1934
1837
1863-7
1821
1812
1830
1820-1840
1812
1829
1814
1840