A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 233
tween the center fra-ming and the posts supporting it, which, when the arch is 62 MASONRY. 8 completed and the mortar has set, are driven out gradually,so as to bring the load on the arch ring without shock. Thecenter should be strong enough to support the weight ofthe arch and a share of the wall… … Fig. 62. are cut out of 2-inch plank, to a radius about 1 inch lessthan that of the intrados of the arch. At c are indicatedpieces of plank, nailed at the crown of the center to spliceand stiffen it. Small bearing strips b, about 1 in. X 2 in. insection, are nailed to the curved pieces a. At d are…
Architecture · Building
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