Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 275
Railof Flight with Level-Landing Kail. the semi-major for the inside curve) on the dividers; fix one leg at 2,and describe the arc Y, cutting the major where the pins are shownfixed, at 0 and o. Now take a piece of string long enough to form a 2^2 STAIR-BUILDIXG loop around the two and extending,… … The same method, for finding the major and foci for the out-sidecurve, is shown in the diagram. The line drawn from h on the outsideof the joint at n, to ic, is the semi-major for the out,si(le curve; and the
Architecture · Building · Carpentry
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