[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 37
ig. 2, as a radius, describe arcs cutting the major axis inthe points 2 and 3 ; place pins, and by the use of thread orcord and pencil, describe the centre curve. Set off eachway from B equal half the width of rail ; from the pointsdescribe the outside and inside curves. To find the vertical angle… … STAIR BUILDING. 35 PLATE XV. Fig. I exhibits the plaji for a?i obtuse-angled staircase, atthe landing. To find the length of curve required for the easing : Drawthe common pitch A B ; set up from C to D equal half theriser ; from the point D, draw the centre of level rail ; drawB F parallel to A E,…
Stair building
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