D'Anvers, N., -1933 · London : T.C. & E.C. Jack ; New York : Dodge Pub. Co. · leaf 28
cular arch I spanning two walls, whilst a more elaborate contrivance consists of two intersecting vaults of the same height crossing each i other at right angles, which was used in Rome as early as j 75 b.c. These two forms were sometimes supplemented by what are distinguished as conches or… … Romans were able to roof in large or small circular spaces, and in some few cases, as in the Baths of Caracalla at Rome, they even to a certain extent anticipated the clever contrivance known as the pendentive, a triangular piece of vaulting spring- ing from the corners of a right-angled enclosure,…
Architecture
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