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Mercury interrupter

1860-1890

Interrupter for induction coil (early form)

1870

Jet interrupter with motor

1900

App's clockwork interrupter

1890

Clockwork interrupter with wooden cover

1904

Large interrupter by Alfred Apps, London

Hammer break interrupter by Ducretet & Lejeune

Electrical interrupter

Electrical interrupter

Electrical interrupter

Mackenzie Davidson interrupter by Cox

1902

Early form of mercury interrupter

1880
Foucault-type mercury interrupter with twin Ruhmkorff commutators, by Ruhmkorff, a Paris ( one glass vessel chipped, vertical tuning arm and weight missing from top of vibrator

Foucault-type mercury interrupter with twin Ruhmkorff commutators

Mercury interrupter

Mercury interrupter

Mercury interrupter and rectifier, part of x-ray installation, by the Cavendish Electrical Co., London, England, 1905-1909.

Mercury interrupter and rectifier

1905-1909
Mercury interrupter driven by an electric motor, with a Bertin commutator mounted on the same base, by Ducretet et Lejeune, Paris, Rue Claude Bernard, 75 (dipper missing)

Mercury interrupter driven by an electric motor

1890-1899
Four pole Wehnelt electrolytic interrupter (without platinum points)

Four pole Wehnelt electrolytic interrupter

1910