"Radiguet And Massiot Mercury Switch"
Exceptional and very rare double Foucault mercury switch for Ruhmkorff coil (large enough coil model for x-rays). Works very well. Circa 1901. Rarely offered for sale, this is a museum piece! just like the DUCRETET mercury switch.... " The current crossing the primary circuit of the Ruhmkorff coil must be made intermittent by the play of a periodic switch whose role is important for the operation of the coil. Interruptions take place between a copper rod driven by an electric motor and a surface of mercury covered with petroleum or amyl alcohol". For more information do not hesitate to contact us at 06 0 2 54 55 Possibility also of exchanges against other equipment...... 
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