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Dobereiner lighter

Dobereiner lighter

1801-1850
Spark gap apparatus

Spark gap apparatus

1900-1910
Spark gap enclosed in wooden box

Spark gap enclosed in wooden box

1885-1895
Adjustable spark gap

Adjustable spark gap

1870-1910
Spark gaps

Spark gaps

1870-1930
Spark gaps

Spark gaps

1870-1930
Spark gap, half only, metal, European, 1750-1850

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

1750-1850
Adjustable spark gap

Adjustable spark gap, early 19th century.

1801-1830
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, in wooden case, glass tube and metal fittings, European, first half 19th century

2 spark gaps

1801-1850
2 spark gaps and one handle, brass and ebonite, possibly used by Riviere, 1870-1930, European

2 spark gaps

1870-1930
Spark gap

Spark gap

Spark gap for electrotherapy machine by Heller, Coudray and Co, Paris, 1902

Spark gap for electrotherapy machine by Heller, Coudray and Co

1902
Transportable mahogamy and brass case with handles, for electrotherapy machine by Heller, Coudray and Co, Paris, 1902

Case for electrotherapy machine by Heller, Coudray and Co

1885-1920
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