A treatise on architecture and building construction . 1 II A Fig. 57. If this method is too costly, the lintel may be cut in 3pieces, as shown at c^ d, and i\ and supported by a heavyangle bar, as described under Lintels. 103. Rubble Arelies.—For rough purposes, arches aresometimes built of rubble, as shown in Fig. 58, in which brepresents the wall carried by the rubble arch, the ringstones of which, as a, should be narrow and roughly dressed. Fig. !58. to a wedge shape. Such arches should always be laid incement mortar, as they depend considerably upon the adhe-sive power of the mortar for t
A treatise on architecture and building construction . 1 II A Fig. 57. If this method is too costly, the lintel may be cut in 3pieces, as shown at c^ d, and i\ and supported by a heavyangle bar, as described under Lintels. 103. Rubble Arelies.—For rough purposes, arches aresometimes built of rubble, as shown in Fig. 58, in which brepresents the wall carried by the rubble arch, the ringstones of which, as a, should be narrow and roughly dressed. Fig. !58. to a wedge shape. Such arches should always be laid incement mortar, as they depend considerably upon the adhe-sive power of the mortar for their stability. 58 MASONRY. § 8 CONSTRUCTION OF AKCITES. 104. Toiissoirs.—The ring of the arch should be builtof the very best kind of ashlar masonry, cut, so that thevoussoirs bear evenly and closely against one another, withthe thinnest possible joints, as it is desirable to have butlittle mortar between the stones. The width of the ringstones is seldom less than 1 foot, or more than 2 feet, andthe thickness (back into the wall) varies from 1 to 3 joints of the stonework should be the same wddththroughout the arch, so that the bearing may be uniformover the entire surface. The thickness of the joints dependssomewhat upon the character of the finish. If the work isfinely dressed, j\ inch is the usual thickness; while in rock-faced work it is seldom made less than | inch; i inch is allthat is usually allowed for the best wor
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
