[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 45
s C and L ascentres, with R B bisected as a radius, describe arcs cuttingeach other in P and R ; then P R should equal R J ; joinL R and L P ; extend L P to N equal R T, Fig. i ; fromthe point D as a centre, with R L, Fig. i, as a radius,describe arcs cutting the major axis in 2 and 3 ; with pinsin… … STAIR BUILDING. 4! PLATE XIX Exhibits a quarter circle of winders at the landing. To draw the elevation of rail : Set up from A to B equalfour risers ; from the point C draw the common pitch andeasing ; tangent to the easing draw C B ; set up from B toD equal half the riser, plus the rise of common…
Stair building
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