Balanced polar mercury contact relay

A new type of relay making use of solid contacts maintained continuously wet with mercury has been developed. It has a symmetrical polar structure, resulting in improved sensitivity and speed compared with the existing neutral structure with similar contacts. It is also particularly well adapted to switching of high frequency circuits. Two magnets are used for polarization, and the relay is adjusted after assembly to desired values of sensitivity for operation in both forward and reverse directions by selective adjustment of the magnet strengths.