Gould, Lucius D., b. 1814. [from old catalog] · New York, A.J. Bicknell & co. · leaf 76
he curve at J; draw P H, equal to S B, Fig. 1, andJ H, equal to D H, Fig. 2. For the width of the mould, and the points forthe pins, to describe the outside and inside curves, set off each way from S,half the width of the rail; at Fig. 2, set off from 3 to 2, equal to the widthof the rail; then 7 6… … Plate 18 Exhibits the plan and elevation for a platform staircase. For want of room, atthe termination of the return flight, we have placed the riser at the starting,beyond the cylinder. The length of the major axis, of the elliptic curve, for the centre of themould, is found at Fig. 1, by drawing…
Stair building
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