Gould, Lucius D., b. 1814. [from old catalog] · New York, A.J. Bicknell & co. · leaf 122
Plate 29 Exhibits the ground plan and elevation, for a staircase with a semi-circle ofwinders ; the wreath formed in three pieces. To find the length of the major axis of the elliptic curve, for the centre ofthe mould, draw D S, Fig. 1, equal to L E, Fig. 3; join J S and extend toR; then P R equals…
Stair building
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
