Mercury switch
A mercury switch has been used to make or break the electric circuit by a contact in which the surface is wetted with mercury. Mercury permits the conduction of electricity at a contact point in the mercury switch. Accordingly, the mercury switch exhibits very small contact resistance and increased stability. Mercury switches are widely used to control pumps, solenoids, relays, alarms, etc. Mercury switches have been known for years with successful applications from air controlling thermostats to light switches and even liquid leveling switches. A mercury switch typically comprises a contact member which is contacted by an armature activated by some magnetic means in order to close the switch. A layer of mercury coats the armature and contact member in order to provide a low resistance contact. The elements of the switch are sealed within a glass tube which also includes a pool of mercury which replenishes the mercury depleted from the armature and contact area. A mercury reed switch comprises a reed armature having its base immersed in a pool of mercury and having its upper end movable between two stationary contacts. Mercury tilt switches are generally built into an evacuated glass tube with electrodes penetrating the glass envelope. The making or breaking of electrical contact occurs as a result of tilting of the switch which causes a quantity of mercury contained therein to flow from one location to another.
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