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Publication of GB435950ApublicationCriticalpatent/GB435950A/en
435,950. Electrostatic meters. GEMANT, A., 4B, Staverton Road, Oxford. July 24, 1934, No. 21690. [Class 37] The permanent field of electrostatic measuring instruments is established by means of " electrets " which are defined as permanently charged dielectrics. A string electrometer has disc or prismatic " electrets " 4, 5, mounted on the casing wall 2 with polarities as shown or with similar polarities adjacent, the casing electrically connecting the parts 4, 5. Quadrant or disc electrometers have their quadrants formed by " electret " bodies, and in the suspended vane type, the vane is an " electret." The surfaces of the " electrets " may be metallized where electric connection is to be made. The air in the instrument casing is dessicated and the walls hermetically sealed.