They were the first buildings to systematically combine rib vaulting, buttresses, and pointed arches. In each corner lie huge angled buttresses that rise to the vaulting. Competitive pole vaulting began using solid ash poles. The ceiling is supported using the barrel vaulting of steel-reinforced concrete arches. The south transept was underpinned and the timber vaulting renovated. It consists of three largely Romanesque naves with Gothic vaulting. She broke a number of American records for high school pole vaulting. The equipment and rules for pole vaulting are similar to the high jump. Palaces had multiple entrances that used post-and-lintel entrances rather than corbel vaulting. Other cathedrals with tierceron vaulting are Norwich, and Exeter. More wooden vaulting forms the lantern roof. These cupolas were occasionally significantly lowered in comparison with the remaining fields of vaulting. Initially, vaulting poles were made from stiff materials such as bamboo or aluminum. Dashed lines show the ribs of the vaulting overhead. This apparatus is thus considered safer than the vaulting horse used in the past.