
Difference Engine No. 1
circa 1832
circa 1832
1838
1860
1858
1839 (original); circa 1988 (replica)
1846
1834-1836
1851
1850-1859
1853
1849
1846-1859
1854
1853
1837
1837
1852
1834-1844
1837
1860
1821-1831
1849
1955; 1830
1842
1830-1850
1846
1860
1822-1840
1837
1812
1822-1850
1831
1843
1840-1850
1850-1860
1826
1849
1850
1829-1851
1855
circa 1854
circa 1854
circa 1840
1850-1859
1820
1839
1827-1850
1825-1835
1830-1840
1840-1851