[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 71
; set off each way from B equal half thewidth of rail ; from the points describe the outside andinside curves ; cut the plank parallel to the centre curve,3-16 wider than the rail ; the joints at right angles to thetangents and face of plank. To find the angles to bevel the plank for the wreath :… … STAIR BUILDING. 67 PLATE XXXI Exhibits the plan of an irregular elliptical staircase. To find the common pitch : Set up from A to B equalthree and one-half risers ; join B C the pitch required. To draw the elevation of the tangents D L A : Set upfrom A to E equal two risers ; draw E F the common…
Stair building
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