ART OF BUILDING. 355 65. The essential parts of each truss are, a pair of princi-pals connected by a collar or wind beam, and two hammerbeams, with queen posts over them, the whole forming threetriangles, which if not secured in their relative positions,otherwise than by the mere transverse… … may be prevented from spreading. 1st, The ends of thehammer beams may be connected with the collar by tensionpieces, a a (fig. 64), by which the thrust on the walls willbe converted into a vertical pressure. 2d, The hammerbeams may be kept in their places by struts, b b, the wallsbeing made…
Architecture · Building
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