(under subclass 108) Systems, wherein the load device is a space discharge device provided with at least one auxiliary electrode in addition to the principal discharge electrodes, the discharge between such auxiliary electrode and another electrode when the gas pressure in the enclosure deviates from normal controlling the operation of the gas or vapor regulating means, the auxiliary electrode being either (1) connected in a control circuit so that the flow of current in the auxiliary electrode circuit controls the operation of the gas pressure regulating means or (2) the auxiliary electrode being composed of or containing a material which when heated by the auxiliary discharge releases or absorbs the required gas or vapor to maintain the desired pressure in the enclosure.
SEE OR SEARCH CLASS
313, Electric Lamp and Discharge Devices,
558+, and 566 for the structure of space discharge devices which have an electrode or electrode support containing or coated with a getter material, or a gas or vapor generating material.
