
Filings coherer, glass tube formed into T-shape at one end and bent round into U-shape at other end with bulb, 1899
1899
1899
1894-1904
1851
1894-1904
1899
1838
1890-1894
1846
1910-1920
1866
1844
1894-1904
1857-1858
1845-1851
1857-1858
1901
1802
1900-1910
1890-1894
1840-1860
1837
1844
1894-1904
1894-1904
1857-1858
1894-1904
1900-1910
1890-1894
1843-1897
1898
1894-1904
1808
1818-1900
1807
1921
1821
1851
1852
1820-1840
1870-1877
1807
1812
1801-1900
1897
1807
1814
1802
1849
1920
1816