Gould, Lucius D., b. 1814. [from old catalog] · New York, A.J. Bicknell & co. · leaf 46
idth of the rail. At Fig. 2, 2 3 and 4 5 each equals the widthof the rail; then 6 3 equals the width of the mould at T, and R 5 equalsthe width of the mould at B. To find the points for the pins, to describethe outside and inside curves from T to D, set off each way from 2 and 3equal to T K. The… … Plate 11 Exhihits the ground flan for a quarter platform staircase; the risers placed atthe spring of the cylinder. To find the major axis of the elliptic curve for the centre of the mould,draw H B, Fig. 1, parallel to C A, equal to S C, Fig. 2; produce the curveT H to J; draw T B and extend to J.…
Stair building
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