from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Architecture The inner curve of an arch.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The inner curve of an arch or vault.
from the GNU version of the Collaborative International Dictionary of English
- n. The interior curve of an arch; esp., the inner or lower curved face of the whole body of voussoirs taken together. See extrados.
from The Century Dictionary and Cyclopedia
- n. In architecture, the interior or lower line, curve, or surface of an arch or vault. The exterior or upper curve or surface is called the extrados. See arch, 2.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the interior curve of an arch
The under, or concave, side of the voussoir is called the intrados or soffit, and the upper, or convex, side, the extrados of the arch.
These spans are dictated by the coursing of the arches: the aim is to achieve high quality masonry with the height of the arch, from the intrados at the spring point to the extrados at the key-stone, contained within the height of two courses of earth blocks.
The drawing of the arches, on the elevation, also shows exactly how the thickness of the arches is included within a precise number of earth block courses, from the intrados at the springpoint to the extrados at the keystone.
The four sides of the mold formed the extrados, the intrados, and the two ends of the block; the other two sides being left open.
The reinforcement consists of arch and transverse bars; the arch bars are spaced 6 ins. on centers 2½ ins. from both extrados and intrados, and the transverse bars are spaced 24 ins. on centers inside both lines of arch bars.
The stability of such structures depends on the position of the line of pressure in relation to the extrados and intrados of the arch ring.
The stability of such structures depends on the position of the line of pressure relatively to the intrados and extrados of the arch ring.
It was determined to attempt to stop these leaks by the application of a water-proof cement coating on the intrados of the arch.
Pressures due to the widening of mines beyond the limits of safety must not be taken as a controversion of this statement, as all arches have limits of safety, more especially if the useless material below the theoretical intrados is only partly supported, or is allowed to be suspended from the natural arch.
For instance, a soft clay arch of larger dimensions, under the condition described early in this paper, would undoubtedly stand if the rods supporting the intrados of the arch were keyed back to washers covering a sufficiently large area.