[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 39
ncil, describe the centre curve. To find the length of curve : From the point C asa centre, with A L, Fig, i, as a radius, describe an arccutting the curve in S. To find the direction of straight rail : From the points Cand S as centres, with H F and A B, Fig. i, as radii,describe arcs cutting each… … SCALE 1 IN. = 1 FOOT, STAIR BUILDING. 35 PLATE XVI. Fig. I exhibits the plan for an acute-angled platform stairs. To continue the common pitch in the tangents : Set offfrom A to B equal one and one-half step ; square up fromA to 4 equal four risers ; from the points i and 4 draw thecommon pitch to…
Stair building
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