A treatise on architecture and building construction . Fig. 56. project about an inch below the soffit of the arch, as indi-cated at b, in order to more tightly wedge together thevoussoirs. The strength of this arch may be increased bynotching one stone into the next, as shown at r, c\ ordowel-pins are sometimes used to bind the stone together. 102. When an arch is so flat as to have practically norise, it should be cut out of one piece of stone, being reallya solid lintel with false joints cut on its face, as shown ata, a, Fig. 57. The. ends of this lintel sliould have a bearingon the wall of
A treatise on architecture and building construction . Fig. 56. project about an inch below the soffit of the arch, as indi-cated at b, in order to more tightly wedge together thevoussoirs. The strength of this arch may be increased bynotching one stone into the next, as shown at r, c\ ordowel-pins are sometimes used to bind the stone together. 102. When an arch is so flat as to have practically norise, it should be cut out of one piece of stone, being reallya solid lintel with false joints cut on its face, as shown ata, a, Fig. 57. The. ends of this lintel sliould have a bearingon the wall of 4 or 5 inches, as indicated by the dotted 8 MASONRY. 57 lines at b,b. If the walls are of brick, about 2 inches of thefront of the stone may be cut away and faced with brick. U I II II II I ._j. 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
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
