. The street railway review . ed of the stream. The pavement also provides a verysatisfactory ; for the support of the forms for the arch ring. The amount of material that may be saved by these two de- rod reinforcement and steel ties, is considerable. making all. the steel, the arch of Fig. 6 contains but 60 per cent as much material as that of Fig. I, and the former Mar. 1902.] STREET RAILWAY REVIEW. 139 is a much stronger and more reliable structure, since it is designedwithout the doubtful assumptions that are necessary in the otherarch as to resistance of the abutments, stability of found
. The street railway review . ed of the stream. The pavement also provides a verysatisfactory ; for the support of the forms for the arch ring. The amount of material that may be saved by these two de- rod reinforcement and steel ties, is considerable. making all. the steel, the arch of Fig. 6 contains but 60 per cent as much material as that of Fig. I, and the former Mar. 1902.] STREET RAILWAY REVIEW. 139 is a much stronger and more reliable structure, since it is designedwithout the doubtful assumptions that are necessary in the otherarch as to resistance of the abutments, stability of foundations, andpressure of earth backing. Fig. 7 is a photographic view of a 12-ft. arch erected for theMr. Lowe Electric Ry„ near Pasadena. Cal. It is shown in sec-tion in Fig. 8. By making the curve of the three-centereda much better appearance is secured than would havewith a full-centered arch of the same span and rise. In this bridgethe reinforcing rods and the ties were !,-in. I rods. PROFIT SHARING AT FIG. 10-CTLVERT FOR INDIANAPOLIS & MARTINSVILLE TRAC-TION CO. smooth, and spaced at intervals of 16 in. The concrete was mixedin proportions of one portland cement, three sand end five gravel. Fig. 9 is a railroad culvert of 18 ft. span, on thi Bi I our rail-road. 13 miles southeast of Indianapolis. In this arch the thicknessat crown was 17 in., base of abutments 7 ft., and thickness at spring-ing 30 in. The steel rods were 1 -in. smooth, round, spaced 2 centers. This bridge, as well as two others of theuse on the Big Four, have carried the heavy traffic of that road,including 150-ton locomotives, without showing cracks or flawsof any kind. Figs. 10 and 11 are of a small full-centered culvert on thitrie road built by tin- Indi Martinsvi near Priendrwood, Ind. Thi mainly tis . pass, is of 4 ft. span and 6 ft. char opening. On account of the
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
