Buch 
Tracts on vaults and bridges : containing observations on the various forms of vaults; on the taking down and rebuilding London Bridge : and on the principles of arches: illustrated by extensive tables of bridges : also containing the principles of pendent bridges, with reference to the properties of the catenary, applied to the Menai Bridge : and a theoretical investigation of the catenary / Samuel Ware
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12

OF CYLINDRICAL VAULTS.

boast. The vault is cylindrical, with arcs doubleauxon entablatures, which profile round on engagedcolumns. The continued bowing line, and bold re-lief of the engaged column, entablature, and arcdoubleau of this enormous vault, may be contrastedwith the insipid flat pannelling and pilasters of St.Peters; while the mild and amiable piety of itsfounder , the idolater Antoninus , is an antithesis tothat of the Christian and most holy father, Giulio theSecond.*

* It was a facetious act of the Duke of Ferrara to convert thebronze statue of this pope, cast by Michael Angelo, into a piece ofartillery, which he called Giulio.