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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 323

An illustration from An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth, 1888, leaf 323
302 THEORY OF ARCHITECTURE. booK II, IV. … CONIC SECTIONS. 10.56. The conic sections, in geometry, are those lines formed by the intersections of a plan-with tlie surface of a cone, and which assume ditlerent forms and ae(juire different propertiesaccording to the several directions of such plane in respect of tlie axis of the cone.…

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