
Difference Engine No. 1
circa 1832
circa 1832
circa 1846
1847-1848
1846
1668; 1924
1835
1849
1838
1830 (original); 1967 (model)
1844
1839 (original); circa 1988 (replica)
circa 1842
1845-1855
1845-1855
1840
1845-1855
1850-1856
1845
1851
1853
1849
1855
1854
1840
1842
1850
1837
1837
1852
1842
circa 1854
1850
circa 1840
1843
1855
1849
1841
1837
1839
1955; 1830
1842
1849
1830-1850
1836
1853
1833
1834-1844
1837
1839
1840-1845