1. A position touch sensor which provides a linear output response over an enhanced proportion of the surface area of said sensor by reducing the bow of equipotential lines along edges of said sensor, which comprises: a resistive layer having a selected substantially uniform resistivity throughout said layer, said layer defining perimeter edges joined at corners; a resistance element positioned proximate each of said perimeter edges of said resistive layer for providing orthogonal electrical fields to said resistive layer, each of said resistance elements having opposite ends joined to proximate ends of adjoining resistance elements, each of said resistance elements being in electrical contact with said resistive layer; a plurality of discontinuous insulator regions of selected effective lengths in said resistive layer arranged along a selected path proximate said resistance elements in a direction toward said area of linear output, and defining spaces of selected effective lengths and width between adjacent of said insulator regions, said resistivity of said resistive layer producing in said spaces resistor electrode elements having selected values of resistance, said selected effective lengths of said insulator regions and said selective resistance values of said resistor electrode elements being selected to produce a selected voltage gradient along said path to compensate for any voltage drop along said resistance element when said orthogonal fields are introduced into said resistive layer through said resistor electrode elements whereby said bow is reduced; and means for deriving output signals corresponding to coordinates of a selected point on said resistive layer within said area of linear output.