<P> One of the simplest truss styles to implement, the king post consists of two angled supports leaning into a common vertical support . </P> <P> The queen post truss, sometimes queenpost or queenspost, is similar to a king post truss in that the outer supports are angled towards the centre of the structure . The primary difference is the horizontal extension at the centre which relies on beam action to provide mechanical stability . This truss style is only suitable for relatively short spans . </P> <P> Lenticular trusses, patented in 1878 by William Douglas (although the Gaunless Bridge of 1823 was the first of the type), have the top and bottom chords of the truss arched, forming a lens shape . A lenticular pony truss bridge is a bridge design that involves a lenticular truss extending above and below the roadbed . </P> <P> American architect, Ithiel Town designed Town's Lattice Truss as an alternative to heavy - timber bridges . His design, patented in 1820 and 1835, uses easy - to - handle planks arranged diagonally with short spaces in between them . </P>

Framing members for a metal truss are connected using