Filings coherer, glass tube curved into near U-shape at one end with coil winding at other end, 1894-1904 1894-1904
Filings coherer, glass tube formed into T-shape at one end and bent round into U-shape at other end with bulb, 1899 1899
Filings coherer, glass tube with side pocket mounted on cylindrical rod with brass screw terminals at ends, 1894-1904 1894-1904
Filings coherer, glass tube bent into U-shape at one end with bulb to form side-pocket on mounting bracket with terminals, 1894-1904 1894-1904
Filings coherer, small glass tube with bulb at one end and cap of red sealing wax at other end, 1898 1898
Coherer, one of two, designed and used by Edouard Branly, unsigned, Europe, 1885-1940 (Part of Branly collection? A182822, B3875) Coherer, one of two 1885-1940