After cutting the spiral from a 4-foot (1.2m) square sheet, pairs of holes were drilled at four points along each turn of the spiral. The holes were plotted in a special pattern, so that if the spiral were "wound up" somewhat like a torsion spring, the holes could be aligned, and wire passed through them to tie the spiral to a supporting X-frame. The winding set up spring tension in the turns of the spiral with the result that the continuous strip tilted inward toward the center, to varying degrees. The resulting geometry constituted a fresnel-type reflector, of depth less than 2" (5cm), yet approximating the effect of a paraboloid shape.