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183!).] THE CIVIL ENGINEER AND ARCHITECT’S JOURNAL. 81 Fig. 18. Flan of the Top of one of the Ribs, Cross Stays, Ties, and Diagonal Braces. d c b c D Fig. 10. Section of the Rib upon an enlarged Scale. BRIDGE OF THE CARROUSEL AT PARIS. REFERENCES TO THE DRAWINGS. Fig. 1. Elevation of one of the side arches, span, 156 feet; rise, 15 feet 6 inches ; and width of pier, 13 feet. Fig. 2. Section cf the arch, and elevation of pier, breadth of roadway, 17 feet, And two foot-paths, each 9 feet; total width, 35 feet. F g 3. Plan of ribs of the arch, shown more at large in figure 18, Similar letters in figures 3, 17, and 18, refer to similar parts. Fig. 4. Section of part of the roadway and footpath over the arch. A, the upper part of the cast-iron rings (figures 14 and 15j.—B, two flitches of oak limber, 12 inches by 8 inches, forming the longitudinal bearers or girders ; they are bolted together with nut and screw bolts. — C, external plates, the inner plate 10 by 12 inches, and the outer plate 8 by 10 inches, bolted together ; on the face is a cast iron paneled fascia, forming part ofthe cornices.—D, transverse bearers or joists, 12 by 10 inches, placed 4 fee 4 inches apart from centre to centre; on the ends are cast-iron caps, forming a modillion to the cornice.—E, a cast-iron moulded capping to the modillion.—F, longitudinal plate, 8 by 12 inches, to carry the edge of foot-path and iron railing, with a fascia and moulding to form the cor nice. — G, a block, 12 by 8 inches.—H, longitudinal bearer, 1by 2 J inches under cehtreof footpath,withaplate 12J by 8 inches tocarrycurboffootpatli, and rebated out to form an aperture for the water from the roadway to escape. K, curb, 8 by 12 inches L, planking of footpath, with a narrow slip of iron let in flush on the edge.—M, iron guards bolted down to curbs.— Curb to roadway, 6 by 7 inches, splayed on the top.—P, planking of oak 4 inches thick.—Q, planking of fir 3 inches thick.—R, road materials. Fig. 5. Elevation of cornice, 3 feet 10 inches high; similar letters refer to similar parts, as in figure 4. Fig. 6. Section of one of the longitudinal beams in the centre. Fig. 7. Section of the abutment.—A, stone springer, the face cut to an angle of 66°.—B, iron abutment plate, with 2 mortice holes, asshown in fig. 89. C, rim of abutment plate, forming a socket; the section of this rim is shown in figs. 11,12, and 13. Figs. 8 & 9. Elevation and section of the back plate, with 2 mortice holes. Fig. 10. Elevation of the front plate or rim, forming the socket. Fig. 11. Section of rim round abutment plate, acioss A. to B. Fig. 12. Ditto ... ... across C. to D. Fig. 13. Ditto ... ... across E. to F. Fig. 14. Elevation and section of one of the rings and connecting pieces or stays between the rings. Fig. 15. Horizontal section and plan of ditto. Fig. 16. Elevation of one of the external lengths of the tubular ribs of cast iron, 13 feet 9 inches long, and 2 feet 9 inches deep, including fl inges. Fig. 17. Elevation of the inside ribs, showing the section of the bolts and ribs. Fig. 18. Plan of top of one of the ribs, showing the edge of the flanges a n d connexions.—A, iron tubular rib.—B, cast-iron hollow cylinders, 4^ inches diameter, forming stays between the ribs.—C, wrought-iron bolts orties, 1^ inches diameter, with nuts and screws.—D, cast-iron diagonal braces, with feathers, average 9 by 5J inches, and a groove at the ends, fitting on, and bolted to the connecting pieces, screwed to both sides of the upper flange of the tubular ribs; similar letters refer to similar parts in figure 17. Fig. 19. An enlarged section of rib, drawn to a scale of two inches to the foot. A, cast-iron casing B, nine thicknesses of timber, bent into a curvi linear form, and bolted together with nut and screw bolts, C C.—D, coating of asphalte.—E E, nut and screw bolts, connecting the two cheeks of the iron rib, with thin slips of wood between the flanges.—F, capping of asphalte.—G, lower part of one of the iron rings, which carries the longitudinal bearers, as shown in fig. 4. This bridge was constructed under the direction of M. Polenceau, engineer. It was commenced in the year 1834, and completed in 1836. It forms a communication over the Seine, between the Place du Carrousel by the Quai du Louvre and the Quai Voltaire. The bridge presents some novel features in its construction, so as to merit the attention of the profession. It is constructed of timber and iron, with stone-cased piers and abutments. The bridge consists of three arches, forming portions of an ellipsis. One only is shown in the accompanying drawings. The centre arch is 187 feet span, and 16£ feet rise; and the two side arches 156 feet span, and 15J feet rise. The total length of the bridge, including piers and abutments, is 558 feet, and the breadth of the roadway 35 feet. The whole length of the bridge in its design forms a flat arch. The chord line of the side arches is slightly removed from the horizontal, so that a line drawn from the springingat the pier to the springing at the abutment would make an angle of one degree with the horizon. The chord of the middle arch is horizontal. The piers are cased with hewn sandstone, and fllled in with con crete. They are aLo erected on a foundation of concrete, and pro tected with sheet piling. The cut-waters at each end of the piers are semi-circular, and are thus carried up to a level with the spring ing of the arch, and terminated with a hemispherical head. Above that level the piers are carried up square, and project about 1 foot 8 inches before the face of the arches. The abutments are also cased