(under subclass 688) Apparatus wherein the first surface is shaped like a closed plane curve generated by a point so moving that its distance from a fixed point divided by its distance from a fixed line is a positive constant less than one. [figure] [caption]A solar dish concentrator is provided having a rotationally symmetrical elliptical shape for focusing a uniform flux density of solar radiation on a receiver. The solar flux pattern reflected to the receiver is evenly distributed over the four quadrants of the receiver without containing any hot spots.
