
Micrometer type mechanical comparator
1855
1855
1830 (original); 1967 (model)
1839 (original); circa 1988 (replica)
1801-1840 (original); 1901 (model)
1775-1799 (original); 1900-1907 (model)
1853
1854
1853
circa 1854
circa 1854
1955; 1830
1855
1856
1863-7
1854
1855
1856
1893-4
1934
2000-100 BCE
1855
circa 1854
1990-96
1705-1737
1856
1854
1934
1870-1877
4000-2001 BCE
1855
1856
1856
1855
1855
1930 (replica); 1834 (original)
1853
1772 (original); 1919 (model)
1610; 1923
1642-1649 (original); 1883 (model)
1853
1668; 1924
1936
2050-1750 BCE
1990-95
1798 (original); 1977 (model)
300 BCE; 1905-1915
1856
2000-100 BCE
1856
patent 1853