Unbekannter Quecksilber-Neigungsschalter?
Mercury tilt switch?
Relais à déplacement de mercure ?

Unknown manufacturer, possibly PECO Welding Systems GmbH (see PECO HYGROTRON ARQ2 and PECO HYGROTRON ARQ3).

At first glance, this device resembles a tilt switch, but its mode of operation is unclear.

Thanks to H.-J. Stettler who donated this tube.

 

101 x 47 mm • 4" x 1" 7/8

 

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