64) of queen-post trusses alternately upright and inverted.
From 1840, trusses, chiefly of timber but with wrought-iron tensionrods and cast-iron shoes, were adopted in America.
Pp. 1-28.) These timber framed structures served as models for the earlier metal trusses which began to be used soon after 1850, and which, except in a few localities where iron is costly, have quite superseded them.
There are four cables, one on each side of the two main trusses or stiffening girders.
Intermediate piers support the trusses in the side spans.