National Geographic : 1922 Jul
THE NATIONAL GEOGRAPHIC MAGAZINE THE INVERTED ARCHES OF THE WELLS CATHEDRAL This curious St. Andrew's Cross shows how builders of the Middle Ages could convert a necessity into a beautiful architectural feature. During the construction of the central tower (see page 73), it was discovered that the four piers supporting it were weak. A second lower arch was built and a third inverted arch was then added. Thus the piers receive a steady support along their whole height.