## On the construction of iron roofs: a theoretical and practical treatise (Google eBook) |

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12 cotan 9 cotan abutment angle irons arch calculating the strains cast iron central strut centre compound truss compression member a b compressive strain construction of iron crown DETAILS OF DITTO determine the strain determine the thrust diagonal bars direct strain distance distributed load DITTO DITTO dome elements employed equal feet flanges forces acting foregoing formula half arch hence horizontal force horizontal strain horizontal thrust inclined truss iron roofs lattice girders lineal foot load per lineal main compression member plate point of support primary truss required to determine riveted roof structures secondary truss semi-arch series of triangles shown in Fig simple truss span strains produced strut c d strut d g Summing the strains tensile strain tension member tension rods total load total strain transmitted triangular girder uniformly distributed vertical force vertical member Warren girder weight wrought iron