International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 298
nd B H are thehaunches. The spaces BG N K and B HML are thespandrels. The material deposited in these spaces isthe spandrel filling. It is sometimes earth and sometimesmasonry or partly of both. Arches according to their forms have different names. RAILROAD CONSTRUCTION. 887 That in Fig. 387 is a… … Fig. 388. Fig. 389. of three circular arcs, is called either an elliptical or athree-centered arch. 1469. To Find the Depth of Keystone.—For cutstone arches, whether circular or elliptic, find the radius O D^Figs. 387, 388, and 389, which will touch the arch at D, F,and E. Rule I-—Add together this…
Railroad engineering
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