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Iron borings coherer (Branly type), 1894

1894

Branly tripod coherer, 1900-1910

1900-1910

Iron borings coherer (Branly type), 1894

1894

Coherer, one of two

1885-1940

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

Ammeter shunt, 6 way, Branly collection no. 27

Ammeter shunt, 6 way, Branly collection no. 27

Magnetic circuit with variable air-gap, Branly collection no. 34

Magnetic circuit with variable air-gap, Branly collection no. 34

Charcoal resistance, Branly collection 10a

Charcoal resistance, Branly collection 10