Gould, Lucius D., b. 1814. [from old catalog] · New York, A.J. Bicknell & co. · leaf 30
ig. 2, as radius, describe arcs, cutting the curve at Dand H; join S H and S D. Then H D is the length of curve, and S D thedirection required. The width of the mould is found by setting off eachway from B, half the width of the rail; the points from which to describethe outside and inside curves.… … Scale, tindv- /foot Plate 7 Exhibits the ground plan of an elliptical turnout at the starting of the staircase;the mould formed ty ordinates; the planTc sawed square, and the joints madeat right angles to the face of plank. The workman will first draw the elliptical curve required fer the…
Stair building
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