Thus, the Fink truss consists of king-post trusses; the Pratt truss (fig.
A frame used to support a weight is often called a truss; the stresses on the various members of a truss can be computed for any given load with greater accuracy than the intensity of stress on the various parts of a continuous structure such as a tubular girder, or the rib of an arch.
The Howe truss of 1830 and the Pratt truss of 1844 are examples.
As railway loads increased and greater spans were demanded, the Howe truss was stiffened by timber arches on each side of each girder.
The Howe truss had timber chords and a lattice of timber struts, with vertical iron ties.
When caught by a gust of c, c, Thin bands of iron with truss planks a, a, and wind, actually lifted the d, d, Vertical rods.