Hints to young architects, comprising advice to those who, while yet at school, are destined to the profession, to such as, having passed their pupilage, are about to travel and to those who, having completed their education, are about to practise, together with a model specification involving a great variety of instructive and suggestive matter (1887)
Wightwick, George · London, Lockwood · leaf 140
the material ismost economically employed, the sections or scantlingsof the pieces being designed to meet such strains only. Triangular Frame.—The ordinary form of a frameis that in which the pieces form a triangle or a systemof triangles.* Let ABC (fig. 37) represent a frame of three bars orpieces… … It is Fig. 37. evident these three forces balance each other, and are therefore proportionalto the three sides of a triangle respectively parallelto their directions. When the three forces are parallel to each other, asin the case of an ordinary roof frame, the triangle offorces becomes a straight…
Architecture
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