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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 1017

An illustration from An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth, 1888, leaf 1017
CBAr. III. DOORWAYS. ;)j7 where it crosses tlie line A D, as at F, will be the centre of the required circle or lobe.A circle witii the radius A F being drawn, the other centres on the lines of division, asA G, A H, &c., are readily found. Another usual geometrical problem in tracery work…

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