Curved position sensitive proportional detectors are described. The first has a radius of curvature of 135 mm and a 60/sup 0/ angular range. The second has a radius of curvature of 360 mm and a 45/sup 0/ angular range. For high quantum efficiency for x-ray energies up to 60 keV, a relatively large x-ray path and high gas pressure are required. The anode wires are suspended in circular arcs by the interaction of a current flowing through them and a magnetic field provided by two permanent magnets placed above and below the wire running parallel to it over the full length of the curved chambers. Anode wire stability under the combined action of the magnetic and electrostatic forces is discussed. (LEW
