. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. FiR. siwfc. S90 THEORY OF AIICIIITECTUKE. l)o( from the aiiglcb of the plan as tliore are ribs intciukd. until tluy mutually intersect eachotiier. Tlie curvatures of the ribs will be clonj^atea as they recede from the primiti\€arch, till tliey reach the centre on the place wlure the groins cross, and where of course curve is a maximijm The rihs thus form, when they are of the same curvature,portions of an inveited conoid. 1499j. In the
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. FiR. siwfc. S90 THEORY OF AIICIIITECTUKE. l)o( from the aiiglcb of the plan as tliore are ribs intciukd. until tluy mutually intersect eachotiier. Tlie curvatures of the ribs will be clonj^atea as they recede from the primiti\€arch, till tliey reach the centre on the place wlure the groins cross, and where of course curve is a maximijm The rihs thus form, when they are of the same curvature,portions of an inveited conoid. 1499j. In the next example i Ji<t. 59?i/i-), the primitive arches are unequal in height, thi;ai-ch A i)eing higher than 15 Ihe jilan remains tlie same as in that immediately preceding;but from the inecjuality of heiglit, a d, c b, must be joined by curved lines, determined onone side by the point a. where e a intersects th^ 1 mger arch. A curved summit rib. aswell longitudinal!V as transversely, may occur with equal or unequal heights of primitive<»rches (as in Jig. 59Ji.) ; but the stellar form on the plan still remains, though
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Keywords: ., bookcentury1800, booksubjectarchitects, booksubjectarchitecture
