Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 265
ponent on the inclined surface is deter-mined. This component is notequal to the horizontal pressuretimes the sine of the angle ofinclination, as one would sup-pose (see Fig. 7), but is greaterby a small amount. Roofs areusually figured on a basis of 40pounds pressure on a verticalsurface. The… … Fig. 7. Theoretical Determination ofNormal Component. 218
Architecture · Building
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