
Difference Engine No. 1
circa 1832
circa 1832
circa 1846
1850
1835
1846
1847-1848
1838
1840
1825-1835
1775-1799 (original); 1900-1907 (model)
1839 (original); circa 1988 (replica)
circa 1848
1850
1830
1830-1850
1821
1829
1840
1849
1837
1837
1834-1844
1837
1822-1840
1850
circa 1840
1839
1843
1821-1831
1849
1955; 1830
1842
1842
1849
1840-1850
1830-1850
1827-1850
1822-1850
1846
1848
1850
1835
1837
1847
1834
1829
1832
1845
1826
1831