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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 297

An illustration from An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth, 1888, leaf 297
276 THEORY OF A RCUlTECTUltE- … Becruse tlie tangent AC and theclioril DF are paiallel, the intor-ceptefl ares (»F Gl) are (Prop.47.) c(iiial. The arc FD is there-fore the ditfcrenee between the arcGLD and the arc GFD. There-fore the angle CAB, which is mea-sured by half the arc FD, is alsomeasured by half the difference…

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