1839.] 



THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 



81 



Fig IS. rian of the 'J'up of one of the Eibs, Cross Stars, Ties, and 

 DLayonal Uraees. 



cue D 



~i 



Fi^. 10. Sfctiou of the Fdh u;)on au er.larged S^-ale. 



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. 



Fg 3. Plan of ribs of the arch, shown more at large in figure 18, Similar 

 letters in figures 3, 17, aud 18, reftr to similar parts. 



Fig. 4. Section of part of the roadw.ay and footpath over the arch. A, 

 ihe upper part of the cast-iron rings (figures 14 and 15). — B, two 

 flitches of oak timber, 12 iiiclies by 8 inches, forming the longitudinal 

 bearers or girders ; they are bolted together with nut andsciew bolts. — C, 

 e.\ternal pla'es,th^ inner plate 10 by 12 inches, and the outer plate 8 by 10 

 inches, bolted together ; on the face is a ca.t iron paneled facia, forming 



part of the cornices D, transverse bearers or joists, 12 by 10 inches, placed 



4 fee 4 inches apart from centie to centre ; on the ends are cast-iron caps, 

 farming a modillion to the cornice. — E, a cast- iron moulded capping to the 

 modilhou. — F, longitudinal plate, 8 by 12 inches, to carry the edge of 

 foot-path and iion railing, with a fascia and moulding to form the cor- 

 nice.— G, ab:ock,12 bj 8 inches. — H, longitudinal bearer, 12Jhy 2i inches 

 under cefttre of footpath, with a plate 124 by 8 inches tocarrycurbof footpath, 

 and rebated out lo 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, by 7 inches, s|)l,a>ed on the top, — P, planking of 

 oak4 inches thick. — Q, planking of firSiuches 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, v\ith 2 mortice holes, as shown in fig. 89. 

 C, rim of abutment plate, foiming a socket; the section of this nm 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. Seciioa of rim rouud 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 e.xlernal lengths of the tubular ribs of cast 

 iron, 13 feet 9 inel}es long, and 2 feet 9 inches deep, including fimges. 



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'-d 

 connexions. — A, iron ttihular rib. — B, cast-iron hollow cylinders, 4^ 



inches diameter, foiming stays between the ribs C, wrought-iron bolts 



or ties, 1^ inches diameter, with nuts and screws D, cast- iron diagonal 



braces, with feathers, average 9 by 5k 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 boiled 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 pait of one of the iron rings, which carries (he 

 longitudinal bearers, as shown in fig. 4. 



This bridge Avas constmcted under the direction of M. Polcnceau, 

 eno-ineer. It was commenced in the year 1834, and completed in 

 18i36. It forms a communication over the Seme, between tlie Place 

 du Carrotisel by the Qiiai du Louvre and the Quai Voltaire. The 

 bridge presents'some novel features in its eoni-truction, so as to merit 

 the attention of the profession. It is constructed of timber and iion, 

 with stone-cased piers and abutments. The bridge consists of three 

 arche.j, forming portions of an ellipsis. One only is shown in the 

 accompanying drawings. The centre arch is 18/ feet span, and I6i- 

 feet rise; "and the two side arches 15(i feet span, and 15^ feet rise. 

 The total length of the bridge, inchuung piers aird abutments, is 55S 

 feet, and the breadth of the roadwtvy 35 feet. The whole length of 

 tlte bridge in its design forms a Hat tirch. The chord line of tlie 

 side arches is slightlv'removcd from the horizontal, so that_ a line 

 dra«n from the springing at the pier to the springing at the tibutment 

 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 filled in with con- 

 crete. They are also 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 cari'ied 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 



