
Difference Engine No. 1
circa 1832
circa 1832
1838
1860
1788
1858
1839 (original); circa 1988 (replica)
1846
1791
1834-1836
1851
1850-1859
1853
1793-1803
1849
1846-1859
1854
1853
1837
1794
1837
1852
1834-1844
1837
hallmarked 1788
1860
1795-1805 (original)
1821-1831
1849
1955; 1830
1842
1830-1850
1846
1860
1822-1840
1796-1798
1790-1830
1782
1790-1860
1780-1800
1801-1823
1796-1797
1837
1812
1822-1850
1780-1850
1796-1826
1790-1840
1805
1831
1843