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Original wheel or steel-disc coherer, 1902

Radio Communication

1902

Spark gap or knob coherer, 1889

Radio Communication

1889

Branly tripod coherer, 1900-1910

Radio Communication

1900-1910

'Italian Navy' detector, 1899-1901

Radio Communication

1899-1901

Iron borings coherer (Branly type), 1894

Radio Communication

1894

Iron borings coherer (Branly type), 1894

Radio Communication

1894

Marconi coherer and Admiralty pattern decoherer, 1900-1910

Radio Communication

1900-1910

Coherer, ebonite, with adjustable contacts, 1890-1896

Radio Communication

1890-1896

Spiral spring coherer, 1890-1894

Radio Communication

1890-1894

Double coherer (experimental), 1895-1906

Radio Communication

1895-1906

Flat steel-spring (or watch-spring) coherer, 1894

Radio Communication

1894

filings coherer, small glass tube with bulb at one end and cap of red sealing wax at other end, 1898

Radio Communication

1898

Coherer, with several needles in contact with crystal, 1894-1904

Radio Communication

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

Radio Communication

1894-1904

Filings coherer, small glass tube with bulb at one end, 1894-1904

Radio Communication

1894-1904

Filings coherer, glass tube with side pocket mounted on cylindrical rod with brass screw terminals at ends, 1894-1904

Radio Communication

1894-1904

Filings coherer, Lodge pattern, 1895-1900

Radio Communication

1895-1900

Coherer with coarse brass turnings, 1894

Radio Communication

1894

Coherer, narrow-bore glass tube, 1894-1904

Radio Communication

1894-1904

Filings coherer, glass tube with side-pocket attached to mounting bracket, 1894-1904

Radio Communication

1894-1904

Coherer, coarse iron turnings, 1894-1904

Radio Communication

1894-1904

Filings coherer, Lodge pattern with two wires inserted into bulb at one end, 1894-1904

Radio Communication

1894-1904

Filings coherer, glass tube capped at ends, 1894-1904

Radio Communication

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

Radio Communication

1899

Filings coherer, glass tube bent at 45-degree angle at one end to form side-pocket, 1898

Radio Communication

1898

Filing coherer, glass tube, fitted on to mounting bracket with terminals, 1894-1904

Radio Communication

1894-1904

Filings coherer, glass tube almost of taper shape, 1894-1904

Radio Communication

1894-1904

Filings coherer, small glass tube with bulb at one end, 1894-1904

Radio Communication

1894-1904

Filings coherer, glass tube, 1898

Radio Communication

1898

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

Coherer, with several needles, 1894-1904

Radio Communication

1894-1904

Filings coherer, glass tube curved into near U-shape at one end with coil winding at other end, 1894-1904

Radio Communication

1894-1904

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

Filings coherer, glass tube bent into U-shape at one end, 1894-1904

Radio Communication

1894-1904

filings coherer, glass tube containing powdered copper, bulb at one end, 1894-1904

Radio Communication

1894-1904

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

Coherer, with steel needle inside part-wound with copper wire, 1894-1904

Radio Communication

1894-1904

Filings coherer, glass tube formed into bulbs at each end at right angles, 1899

Radio Communication

1899

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

Coherer, one of two, designed and used by Edouard Branly

Telecommunications

1885-1940

Experimental coherers designed or used by Sir Oliver Lodge, 1894-1904

Radio Communication

1894-1904
Commercial model of a wheel or steel-disc coherer (thin-film detector), made by Muirhead and Company, Beckenham, London, England, 1902. For use by the Lodge-Muirhead Wireless and General Telegraphy Syndicate Ltd.

Wheel or steel-disc coherer (thin-film detector), 1902

Radio Communication

1902

Two iron boring coherers (Branly type), 1894

Radio Communication

1894
Coherer, one of two, designed and used by Edouard Branly, unsigned, Europe, 1885-1940 (Part of Branly collection? A182822, B3875)

Coherer, one of two, designed and used by Edouard Branly

Telecommunications

1885-1940

Wheel or steel-disc coherer (thin-film detector), 1902

Radio Communication

1902
Coherer tapper; rare

Coherer tapper

Radio Communication

1900 - 1915
Coherer tapper; rare

Palmer coherer tapper

Radio Communication

1900-1915