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trusses which began to be used soon after 1850, and which, except in a few localities where iron is costly, have quite superseded them.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.
These carry temporary trusses of timber or steel.
A multiple truss consists of a number of simple trusses, e.g.
Some timber bridges consist of queenpost trusses in the upright position, as shown diagrammatically in fig.
Compound trusses consist of simple trusses used as primary, secondary and tertiary trusses, the secondary supported on the primary, and the tertiary on the secondary.