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Material
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Branly tripod coherer, 1900-1910

1900-1910

Coherer, one of two

1885-1940

Iron borings coherer (Branly type), 1894

1894

Iron borings coherer (Branly type), 1894

1894

Coherer, one of two

1885-1940

Two iron boring coherers (Branly type), 1894

1894
Brass cylinder, possibly containing electrical coil, Branly collection

Brass cylinder, Branly collection

Charcoal resistance, Branly collection 10a

Charcoal resistance, Branly collection 10