
Difference Engine No. 1
circa 1832
circa 1832
circa 1846
1835
1850
1845-1855
1846
1847-1848
1838
1825-1835
1840-1851
circa 1848
1830
1839 (original); circa 1988 (replica)
1820
1775-1799 (original); 1900-1907 (model)
1850
1851
1830-1850
1821
1829
1840
1851
1837
1837
1822-1840
circa 1854
1850
circa 1854
circa 1840
1849
1842
1840-1850
1827-1850
1845
1842
1856
1893-4
1934
1830
1840
1825
1821-1850
1837
1845
1840
1826
1845
1834
1834
1830-1850