Spindler & Hoyer Mercury-Dip Contact Relay

This relay was activated by an external circuit during an experiment. Upon activation, the electromagnets pulled down the armiture which dipped a metal pin into a pool of mercury and closed an electrical circuit. The heavy weight on the far end of the armiture could be used to slow the operation of the relay and therefore introduce a delay into the circuit closure. It was manufactured by Spindler & Hoyer of Gottingen, and imported by Arthur H. Thomas., Philadelphia.