[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 65
2, as a radius, describe an arc cutting thecurve in C ; draw D S equal S C, and C S equal J C, Fig. 2 ;extend S C for the direction and length of straight rail ; setoff each way from B equal half the width of rail ; from thepoints draw the outside and inside curves. To find the angles to bevel the… … Fig.3 SCALE I IN. = 1 FOOT STAIR BUILDINCx. 6l PLATE XXIX Exhibits a plan for circular stairs. To find the common pitch : Square up from the tangentE C to S equal four risers ; join S R, the pitch required. To draw the mould for the arc B C, Fig. i : Square upfrom A to C, Fig. 2, equal S E, Fig. i…
Stair building
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