Radford's cyclopedia of construction; carpentry, building and architecture. Based on the practical experience of a large staff of experts in actual constrcution work (1909)
Johnson, Alfred Sidney, 1860-, Radford, William A., 1865- · Chicago Radford Architectural Co · leaf 130
idand the tie AC incapable of extension, B will PRACTICAL CARPENTRY 111 become a fixed point. This, then, is the ordinarycouple roof, in which the tie AC is a third piece oftimber, and which may be used for spans ofUmited extent; but when the span is so great thatthe tie AC tends to bend downward… … A D ^ ^m ^ FIG. 133 be impossible for AC to bend downwards so longas AB, BC remain of the same length: D, there-fore, like B, will become a fixed point, if the tieBD be incapable of extension. But the span maybe increased or the size of the rafters AB, CB bediminished, until the latter also have a…
Architecture · Building
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Libro primo [-quinto] d'architettvra ... (1566)](https://img.insideoutlibrary.com/img/200/ia-libroprimoquinto00serl-13-27.webp)