20070116
Arch@NTU Library
An arch is a curved structure capable of spanning a space while supporting significant weight (e.g. a doorway in a stone wall). The arch was first developed in the Indus Valley civilization circa 2500 BC [1] and subsequently in Mesopotamia, Egypt, Assyria, Etruria, and later refined in Ancient Rome. The arch became an important technique in cathedral building and is still used today in some modern structures such as bridges.
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