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 75
h there are many fine examples in which this is not thecase. We propose to describe the principal varieties of theseroofs, without reference either to their decorative details, orto their chronological arrangement, our object here beingsimply to explain the principles on which they were… … flooring, as there are no principals, purlins, or even ridge.It is a defective form of roof, as the rafters have a tendencyto spread and thrust out the walls. In then example before us, this effect has been pre-vented by the insertion of tie-beams, fromLMii which the collars have been propped up…
Building
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