Cyclopedia of architecture, carpentry, and building; a general reference work .. (1912)
American School (Lansing, Ill.) · Chicago, American school of correspondence · leaf 409
Jomt Step Step 1 The same method, for finding the major and foci for the outsidecurve, is shown in the diagram. The line drawn from b on the outsideof the joint at n, to w, is the semi-major for the outside curve; and the … Riser Fig. 132. Arrangement of Risers around Quarter-Turn Giv-ing Tangents Equal Pitch with Connecting Flight. points where the outside pins are shown on the major will be the foci.To draw the curves of the mould according to this method, which 335 72 STAIR-BUILDING
Architecture · Building
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