The roof is supported by timber king post trusses. In roof construction such as king post, queen post, crown post framing. There is also a king post roof. Its wing is a topless design, lacking upper rigging and the supporting king post. It is a rare example of King post, and timber frame roof architecture. The king post roof of the nave has also been praised. The old king post roof had been installed in 1714. A bridge would require two king post trusses with the driving surface between them. The crane, including the steam plant, could slew on a central king post bearing. The marble commemorative tablet, designed by the architects, rests directly beneath the king post. The king post truss is also called a "Latin truss". The structure is supported with a king post framework and, presumably, connects to nearby pipelines. The king post truss is used for simple roof trusses and short-span bridges. Pont-y-Cafnau, the world's first iron railway bridge, is of the king post type. King post trusses are also used as a structural element in wood and metal bridges.