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Adjustable spark gap

Adjustable spark gap, early 19th century.

King George III

1801-1830

Spark gap enclosed in wooden box, for high frequen

Therapeutics

1885-1895

Spark gap apparatus

Therapeutics

1900-1910

Dobereiner lighter, glass body, metal lid and fitt

Therapeutics

1801-1850

Adjustable spark gap, glass, brass with vulcanite

Therapeutics

1870-1910

Spark gap, half only, metal, European, 1750-1850

Therapeutics

1750-1850
Four thyratron valves, in cardboard boxes, glass, with protective padding, European, second half 19th century

Four thyratron valves, in cardboard boxes, glass,

Therapeutics

1851-1900
2 spark gaps, brass and ebonite, possibly used by Riviere, 1870-1930, European

2 spark gaps, brass and ebonite, possibly used by

Therapeutics

1870-1930
Spark gap, wood casing, metal fittings, European, 1880-1910

Spark gap, wood casing, metal fittings, European,

Therapeutics

1880-1910
Two rods of glass with cross bar with ball one end and ebonite arm the other, possibly Riviere, European, 1880-1920

Two rods of glass with cross bar with ball one end

Therapeutics

1880-1920
2 spark gaps, in wooden case, glass tube and metal fittings, European, first half 19th century

2 spark gaps, in wooden case, glass tube and metal

Therapeutics

1801-1850