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Spark gap enclosed in wooden box

1885-1895

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

1750-1850

Spark gap apparatus

1900-1910

Dobereiner lighter

1801-1850

Adjustable spark gap

1870-1910
Adjustable spark gap

Adjustable spark gap, early 19th century.

1801-1830
Spark gap, wood casing, metal fittings, European, 1880-1910

Spark gap

1880-1910
Four thyratron valves, in cardboard boxes, glass, with protective padding, European, second half 19th century

Four thyratron valves

1851-1900
2 spark gaps, in wooden case, glass tube and metal fittings, European, first half 19th century

2 spark gaps

1801-1850
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 and ebonite arm the other

1880-1920
2 spark gaps, brass and ebonite, possibly used by Riviere, 1870-1930, European

2 spark gaps

1870-1930