The stability of such structures depends on the position of the line of pressure relatively to the intrados and extrados of the arch ring.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"] Reference

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.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"] Reference

The concrete arch was placed in sections, from 25 to 50 ft. in length, with a rather wet mixture and a back form on the steep slope of the extrados.    From Wordnik.com.  [Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158] Reference

Infilling the extrados of the vaulting using stabilized cement mortar should also be carried out in such a way as to ensure a correct balance of the post-compression which will finally stabilize the vaulting.    From Wordnik.com.  [Chapter 7] Reference

In laying the brick in the arch, the five courses of the ring were carried up as high as the void between the extrados and the rock would permit and still leave a working space in which to place the water-proofing.    From Wordnik.com.  [Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158] Reference

The concrete was then carried up to the springing lines, the arch centers in two pieces were placed; the arch bar of the reinforcement was placed and the extrados forms erected up to the 45° lines, all as shown by Fig. 259.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

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.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

By reference to Plate XII it will be seen that the water-proofing, which in the concrete-roof tunnels extended the full height of the sides to the 15° line, was carried in the brick-roof tunnels completely around the extrados of the arch.    From Wordnik.com.  [Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158] Reference

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.    From Wordnik.com.  [Chapter 7] Reference

"Are you still wondering what the extrados of a voussoir is?".    From Wordnik.com.  [The Strange Case of Mortimer Fenley] Reference

The form of the mound may be described as reproducing the extrados of a depressed arch.    From Wordnik.com.  [A History of Art in Chaldæa & Assyria, v. 1] Reference

In a flat arch the voussoirs are wedge-shaped, but the extrados and intrados are composed of straight lines.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 1: Aachen-Assize] Reference

The pavement of the terrace, which consists of a double bed of large bricks, rests upon the extrados of the upper channel.    From Wordnik.com.  [A History of Art in Chaldæa & Assyria, v. 1] Reference

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.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 1: Aachen-Assize] Reference

The rise of an arch is the height of the highest point of its intrados above the line of the impost; this point is sometimes called the underside of the crown, the highest point of the extrados being the crown.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 1: Aachen-Assize] Reference

The openings left at the summits of the other courses must have been filled in in some way, and, in fact, the line of voids which ran along the top of the extrados was filled in with brick earth, beaten tight and forming the best of keys.    From Wordnik.com.  [A History of Art in Chaldæa & Assyria, v. 1] Reference

Tomlinson, can you tell me what the extrados of a voussoir is? ".    From Wordnik.com.  [The Strange Case of Mortimer Fenley] Reference

A dozen State cattle-shows, The style is Gothic, the three transepts looking like those of as many cathedrals stripped of the roof, the extrados taking its place.    From Wordnik.com.  [Lippincott's Magazine of Popular Literature and Science Volume 17, No. 100, April, 1876] Reference

Define the intrados and extrados of an arch.    From Wordnik.com.  [Scientific American Supplement, No. 561, October 2, 1886] Reference

The extrados of a voussoir ---- ".    From Wordnik.com.  [The Strange Case of Mortimer Fenley] Reference

Wayzata, 952-473-0423, www. extrados.com.    From Wordnik.com.  [StarTribune.com rss feed] Reference