
Difference Engine No. 1
circa 1832
circa 1832
1775
1838
1771-1830
1788
1839 (original); circa 1988 (replica)
1791
1770
1834-1836
1776
1793-1803
1837
1794
1837
1837
1820
1782
1822-1840
1774-1831
1787
1803-1828
1764
circa 1840
hallmarked 1788
1795-1805 (original)
1821-1831
1955; 1830
1805
1796-1826
1800-1830
1796-1797
1796-1798
1790-1830
1801-1830
1771-1800
1771-1830
1807
1790-1840
1761-1820
1785
1790-1819
1790-1819
1790-1819
1790-1819
1790-1819
1758-1819
1790-1819
1790-1819
1790-1819
1758-1773