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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 401

An illustration from An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth, 1888, leaf 401
as the twoojiposite sides become longer than the width, and wlien the length is twice the width, oreven muv.h less, the thrusts must be calculated on the princijde of cyliiuirical vaulting ;and as in this species of vaulting tlie greatest effort occurs in or towards the middle ofihe sides, opening…

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