
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
1840
1837
1837
circa 1840
1934
1830
1840
1825
1837
1840
1826
1834
1834
1834
1832
1893-4
1863-7
1829
2000-100 BCE
1835
1837
1829
1826
1831
1838
1837
1833
1831
1836
1837
1839
1838
1837
1955; 1830
1839
1838
1826
1839
1990-96
1830
1839
circa 1840