Arched structure

Claim 1

AN ARCHED STRUCTURE FORMED OF INTERLEAVED SERIES OF ELEMENTS, THE ELEMENTS BEING FORMED OF PLATES SHAPED TO FORM DIHEDRAL ANGLES ABOUT THE LONGITUDINAL AXES OF THE PLATES, EACH PLATE HAVING TWO LONGITUDINAL DIAGONAL EDGES AT EACH SIDE OF THE LONGITUDINAL AXIS, THE EDGES BEING REVERSELY INCLINED FROM THE MIDDLE TOWARDS THE ENDS OF THE PLATE, THE PLATE BEING NARROWER AT THE ENDS THAN IN THE MIDDLE, THE ENDS OF THE PLATES IN EACH SERIES BEING OF THE SAME WIDTH AS THE ENDS OF THE PLATES, IN THE ADJOINING SERIES, AND HAVING SHORT ANGULAR END EDGES ARRANGED TO FORM A RE-ENTRANT ANGLE AT EACH END OF THE PLATE, THE APICES OF THE RE-ENTRANT ANGLES LYING IN THE LONGITUDINAL AXES OF THE PLATES, THE MATCHING RE-ENTRANT ANGLES AT THE ENDS OF THE ADJACENT PLATES BEING OF SUCH ANGULARITY IN RESPECT TO THE LONGITUDINAL AXES OF THE PLATES THAT THE ADJOINING SHORT ANGULAR EDGES BETWEEN ANY TWO PLATES WILL LIE IN A PLANE CORRESPONDING WITH THE RADIUS OF CURVATURE OF THE ARCHED STRUCTURE AT POINTS WHERE SUCH REENTRANT ANGULAR EDGES MEET.