
Difference Engine No. 1
circa 1832
circa 1832
1829
1835
1821
1837
1837
1837
1820
1821-1831
1837
1826
1837
1833
1835
1829
1834
1829
1832
1834
1834
1826
1831
1934
1837
1821
1830
1825
1836
1825-1835
1837
1893-4
1863-7
2000-100 BCE
1820-1830
1831
1955; 1830
circa 1821-1825
1821
1821
1832
1826
1990-96
1823
1824
1830
1830-1835
1830 (original); 1967 (model)
1775-1799 (original); 1900-1907 (model)
1820
1826