A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 157
he outeredge, or extrados; that is to say, the mortar joints are widerat the upper surface of the brick ring than at the lower sur-face, so that there is more mortar at the top of the jointthan at the bottom. The bed surfaces of the brick aretherefore not on radial lines, as they are in a gauged… … Fig. 112. headers, and show an 8-inch reveal on the under side orsoffit of the arch. Arches built in this way, of a series ofrowlocks or concentric rings, have no connection betweenthe rings other than that afforded by the adhesion of themortar. Rowlock arches are frequently bonded back into the…
Architecture · Building
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