Gould, Lucius D., b. 1814. [from old catalog] · New York, A.J. Bicknell & co. · leaf 148
cutting the line from A at L ; draw L P tangent to the curve on the plan, thenA P is the length of curve required, and P L is the directing ordinate forthe mould. To draw the mould at Fig. 7 : From the point L, draw the seat at rightangles to L P ; set up from S to R, equal to L C, Fig. 6; join L R…
Stair building
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