Gould, Lucius D., b. 1814. [from old catalog] · New York, A.J. Bicknell & co. · leaf 142
B, cutting the pitch at D; from the point D, draw D B at right angles to NB; from the point B as centre, with B N as radius, describe an arc, cutting thecurve at R; join B R, then N R is the length of curve required. To find the length of the major axis of the elliptical curve, required forthe…
Stair building
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