Moore, Charles Herbert, 1840-1930 · New York, London, The Macmillan Company · leaf 40
leaving an open space between it and thewall of the enclosing drum of 1.26 metres in width. Abovethis vertical portion the extrados is stepped by several coursesof masonry, somewhat after the manner of the dome of thePantheon. From the reentrant angles of the octagon {a. Fig. 6)soUd abutments… … Dissection of the vault of the Baptistery. each side of the octagon into three compartments, and overeach of these compartments a barrel vault, on an axis inclinedin conformity with the slope of the roof, is turned. The upperends of these vaults intersect on the surface of the dome, asshown in…
Architecture, Renaissance
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