
Coherer with coarse brass turnings, 1894
1894
1894
1894-1904
1894-1904
1895-1900
1894-1904
1894-1904
1893-4
1899
1890-1896
1894-1904
1894-1904
1890-1894
1899-1901
1894-1904
1934
1894-1904
1894-1904
1902-1907
1894-1904
1898
1894-1904
1900
1896
1892
1897
1907
2000-100 BCE
1890-1900
1891-1900
1902
1885-1895
1890-1899
1872 (original); 1909 (model)
1898
after 1903
1892
1886
1884
1904
circa 1885
1888
circa 1905
1890
1898
1899
1890
1899
1905
1896
1895-1899