. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. ~^h. Fig. 620. equal to half tbe span of tbe arcb, and make CD equal to the height, and Ay parallel andequal to CD. In C(/ make Ck equal to CD. Divide A; and AC each into two equal i) 1 in AC draw kn, and through I in Aj draw ID, cutting hn at n. Bisect wDby the perpendicular Ig, and from g with the radius gn or gD describe the arc nDih. Drawgh parallel to AB, and join hli, and produce /(B to meet the arc nDh in i. Join (ji cuttingAM 11
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. ~^h. Fig. 620. equal to half tbe span of tbe arcb, and make CD equal to the height, and Ay parallel andequal to CD. In C(/ make Ck equal to CD. Divide A; and AC each into two equal i) 1 in AC draw kn, and through I in Aj draw ID, cutting hn at n. Bisect wDby the perpendicular Ig, and from g with the radius gn or gD describe the arc nDih. Drawgh parallel to AB, and join hli, and produce /(B to meet the arc nDh in i. Join (ji cuttingAM 111/ and make Ce equal to C/. Join ge, and produce it to meet the arc wD// in the radius// describe the arc /B, and from e with tbe radius eA describe thearc A,7i«. Then AwD/B is the arcb required. 1935. All elliptical arch ADB (/// >V2\.) hci„ggiccn, to draw Ihcjnintsfor a given number Chap. III. MASONRY. of arch stones. Find the centres c, /, (/ in the same manner as if the arcli were to be drawn ;join ye and produce it to meet the arch ; also join g,f and produce it to meet the arc in the elliptical curve AD 15 into a
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