Ring transformer, 1892
1892
1892
1934
1872 (original); 1909 (model)
1955; 1830
2000-100 BCE
1893-4
1892
1775-1799 (original); 1900-1907 (model)
1990-96
1893
1934
1705-1737
1893
1772 (original); 1919 (model)
1930 (replica); 1834 (original)
1801-1840 (original); 1901 (model)
4000-2001 BCE
1830 (original); 1967 (model)
1801-1892 (prepared); 1946 (element replaced)
circa 1893
circa 1893
circa 1893
circa 1893
1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893
circa 1893