Medieval architecture, its origins and development, with lists of monuments and bibliographies (1909)
Porter, Arthur Kingsley, 1883-1933 · New York, The Baker and Taylor Company · leaf 110
required level by pointing, stilting, and depressing, and itbecame no longer necessary to resort to this device. Thus after c. 1140 the principle of the broken rib vault wasthoroughly established, and the problem of vaulting the am-bulatory had been mastered. Occasionally, it is true, examplesof… … III. 168. — Ambulatory of Sens. Perspective
Architecture, Medieval
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