Impulse sender (dial), 1915
1915
1915
1915
1915
1955; 1830
1914
1914
1915
1915
1934
1913
2000-100 BCE
1914
1915
1914
1914
1914
1705-1737
1930 (replica); 1834 (original)
circa 1913
1913
1903 (original); 1982 (model)
1772 (original); 1919 (model)
1913
circa 1915
1913
1915
1990-96
1934
1830 (original); 1967 (model)
1915
4000-2001 BCE
1914
1801-1892 (prepared); 1946 (element replaced)
1914
1962-05
1913
1914
1970-1900
10000-5000 BCE
1915
1915
1913
1914
1913
1915
1914
1713-1750
1913
1913
1914