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An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth (1888)

Gwilt, Joseph, 1784-1863, Papworth, Wyatt Angelicus Van Sandau, 1822-1894 · London Longmans, Green · leaf 618

An illustration from An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth, 1888, leaf 618
Til. MASONRY. 597 … 1957. Jf/ien ruches in/ersect an inclined vault, and the projections of the arrisses cross■Mch other at riyht angles, and the angle of elevation of one of the semicircular vertical ribsof the ascending avenue or opening is given to ohtain the geometrical construction; so thatthe cross arches may be…

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