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| | arch (architecture) - Hutchinson encyclopedia article about arch (architecture) |
 | | The principle of the arch was known to the ancient Egyptians, Mesopotamians, and Greeks but arches were seldom used until Roman times, when the semicircular arch was universally adopted. |
 | | The principal terms connected with any form of arch are the span, rise, and springing line; and the various parts: abutment, archivolt (moulding around the face or underside of an arch), crown, extrados, impost, intrados, keystone, spandrel, springer, and voussoir. |
 | | The principal types of arch, according to their shape, are semicircular or ‘round’, segmental, stilted, round horseshoe, equilateral (pointed, with the radii equal to the span), lancet (pointed, with radii larger than the span), four-centred (pointed, with four arcs), pointed horseshoe, three-centred, cusped, and elliptical. |
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