1. A capacitive displacement transducer, comprising a scale member bearing a transducer surface, a slider member bearing a transducer surface, means for mounting said members for relative movement over a displacement interval throughout which said transducer surfaces are in predetermined spaced opposition, a pattern of spaced elongated conductive elements fixed on said transducer surface on said scale member extending over said displacement interval arranged transversely to the direction of relative movement between said members, a pattern of conductive elements fixed on said transducer surface of said slider member including two elongated coupling electrodes in spaced alignment parallel to the direction of movement opposite said elements on said scale member, and at least one array composed of two interdigitated sets of transmitter electrodes arranged parallel to said coupling electrodes, said array being divided lengthwise into two parts in space quadrature with each other at least coextensive respectively with said coupling electrodes in the direction of the length of said coupling electrodes, means for furnishing electrical connections to said slider electrodes including means for electrically connecting said transmitter electrodes, respectively, in an external circuit and means for electrically connecting said two coupling electrodes respectively in an external circuit.