Gothic architecture in France, England, and Italy (1915)
Jackson, Thomas Graham, Sir, 1835-1924 · Cambridge [Eng.] University Press · leaf 62
ince us that the freedom of the arch, begun at idea ofS. Ambrogio and completed by the adoption of the seatingpointed form, entirely upset the primitive idea of the abandonedcross-vault being generated by the intersection of twohalf-cylinders or half-barrels either round or pointed.The surfaces of… … Fig. 9. much for this reason as for that of strengthening thelines of intersection that ribbed vaulting was invented. RibandIt was impossible to make an even junction by simply JauUingbringing the curved surfaces together without so muchwinding and twisting as to be dangerous: but it waseasy enough…
Architecture, Gothic
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