
Difference Engine No. 1
circa 1832
circa 1832
1835
1838
1825-1835
1830
1775-1799 (original); 1900-1907 (model)
1839 (original); circa 1988 (replica)
1829
1837
1837
1934
1830
1825
1837
1826
1834
1834
1835
1834
1832
1829
1837
1833
1837
1839
1837
1839
1955; 1830
1837
1826
1831
1893-4
1838
1863-7
1829
2000-100 BCE
1831
1836
1838
1838
1826
1839
1990-96
1830
1839
1839
1839
1830-1835
1830
1831