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Marconi coherer and Admiralty pattern decoherer, 1900-1910

Radio Communication

1900-1910

Iron borings coherer (Branly type), 1894

Radio Communication

1894

'Italian Navy' detector, 1899-1901

Radio Communication

1899-1901

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

Radio Communication

1894-1904

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

Spark gap or knob coherer, 1889

Radio Communication

1889

Spiral spring coherer, 1890-1894

Radio Communication

1890-1894

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

Radio Communication

1894

Coherer, coarse iron turnings, 1894-1904

Radio Communication

1894-1904

Original wheel or steel-disc coherer, 1902

Radio Communication

1902

Branly tripod coherer, 1900-1910

Radio Communication

1900-1910

Coherer, ebonite, with adjustable contacts, 1890-1896

Radio Communication

1890-1896

Iron borings coherer (Branly type), 1894

Radio Communication

1894

Double coherer (experimental), 1895-1906

Radio Communication

1895-1906

Coherer, with several needles in contact with crystal, 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 with two wires inserted into bulb at one end, 1894-1904

Radio Communication

1894-1904

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

Radio Communication

1898

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

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

Radio Communication

1898

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, 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

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

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

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, glass tube almost of taper shape, 1894-1904

Radio Communication

1894-1904

Coherer, with several needles, 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 bent into U-shape at one end, 1894-1904

Radio Communication

1894-1904

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

Filings coherer, Lodge-Muirhead system, 1900-1910

Radio Communication

1900-1910

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

Radio Communication

1894-1904

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

Radio Communication

1894-1904

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

Telecommunications

1885-1940
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
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

Two iron boring coherers (Branly type), 1894

Radio Communication

1894

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