Gould, Lucius D., b. 1814. [from old catalog] · New York, A.J. Bicknell & co. · leaf 56
arc, cutting the curve at R. For the direction of the straight wood,draw R H equal to N H, Fig. 2, and J H equal to R H, Fig. 2. For thewidth of the mould, and the points for the pins to describe the outside andinside curves, set off each way from L half the width of the rail. From thepoints draw… … Scale i iruJu « i foot. Plate 13 Exhibits the ground plan and elevation of an acute angled platform staircase;the wreath in two pieces. To find the major axis of the elliptical curve required for the centre of themould. At Fig. 1, draw B S parallel to C R, equal to C D, Fig. 2: producethe curve A B…
Stair building
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