
Difference Engine No. 1
circa 1832
circa 1832
1838
1834-1836
1837
1837
1834
1832
1825
1837
1826
1834
1834
1808
1808
1809
1829
circa 1805
1807
1815
1815
1810-1817
1837
1807
1821
1805
1812
1830
1807
1812
circa 1808
1807
1814
1802
1816
1802
1835
1837
1821-1831
1838
1815-1825
1806
1837
1805
1831
1803-1828
1820
1955; 1830
1807
1934
1837