Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 127
er al-ternately, 233.— To describe tke Greciafi torus and scotia. Join theextremities, a and b, {Fig. 131;) and from/, the given projectionof the moulding, draw/ o, at right angles to the fillets; from b,draw b h, at right angles to a b ; bisect a b in c ; join / and c,and upon c, with the radius,… … ters of the required ellipse. To describe the curve by interset--tion of lines, proceed as directed at Art. 118 and noie ; by atrammel, see Art^ 125 ; and to find the foci, in order to describe itwith a string, see Art. 115.
Carpentry · Architecture
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