Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)
Bullock, John · New York : Stringer & Townsend · leaf 70
mon rafters but on a ;polc jplate^ the tie beams resting eitheron a continuous plate, or on short templates of wood orstone. 111. Where the span is considerable, the tie beam is sup-ported at additional points by suspension pieces called queenposts (fig. 52), from the bottom of which spring… … struts ; and, by extending this principle ad infinitum, wemight construct a roof of any span, were it not that a prac-tical limit is imposed by the nature of the materials. Some-times roofs are constructed without king posts, the queenposts being kept apart by a straining piece. This construc-tion…
Building
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