Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 248
is another view oftlie.se tangents in positionplaced over and above theplan tangents of the well-hole. It will be observedthat this figure is made upof Figs. 88 and 91 com-,billed. Fig. 88, as here]iresented, is shown to con-nect with a level-lajidingrail at a. The joint havingbeen made square to… … 200 STAIR-BUILDING 40 gent?/i of the lower wreath, and also square to the inclined tangent dof the upper wreath; the two tangents, aligning, guarantee a squarebutt-joint. The upper joint is made square to the tangent d, whichis here shown to align with the rail of the connecting flight; the…
Architecture · Building · Carpentry
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