. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. FiR. 611. I 954. Where the piers supporting groins (fff-64i.) are made octangular, tlie angles of thegroins slioiilcl be cut oft or arched as ribs, bywhich they are rendered much stronger thanwhen they are square. In stone groins, wherethe arch is cut oft, there is no advantage in pointof strength, and rather a defect in point of ap-pearance, to the groined angles. Arches intersecting a coved ceiling aresimilar to groins. Such arches are call
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. FiR. 611. I 954. Where the piers supporting groins (fff-64i.) are made octangular, tlie angles of thegroins slioiilcl be cut oft or arched as ribs, bywhich they are rendered much stronger thanwhen they are square. In stone groins, wherethe arch is cut oft, there is no advantage in pointof strength, and rather a defect in point of ap-pearance, to the groined angles. Arches intersecting a coved ceiling aresimilar to groins. Such arches are called lunettes,and are generally ))ractised for semicircul ir-headed windows piercing the coves in the ceilintj/iff. 643. exhil)its a plan and section of such arches. 1956. A dome is a solid, which may be con-ceived to be generated by the figure of the b isediminishing as it rises, till it becomes a point atthe summit ; and when a dome has a polygonalbase, the arches are plain arches, and the con-struction is similar to that of a groin. A of this kind upon a rectangular plan isshown in plan 13 (/iij. 644.); the sections .\ Abeing
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