. Concrete bridges and culverts, for both railroads and highways . 84 N., Dec. 5, 07 85 86 10 I10 I 3636 19001900 Jeup N., Apr. 11, , Apr. 11, 01. 8788 89 2:66 90 9 I 3^ 8 36121218241212 1902 18951905 54,000 Concrete Steel Co.,Von .. , Mar. 17, 07 R., Feb. 13, 04 N., Oct. 3, 91 92P3 3x1 1905R. H. R Sept 22 06 «)4 Hibbard R Feb. 10 06 95 Kahn 96 %4x% 190619071901 H. 25,680 National Bridge Co. q? 98 N., Aug. 1, , Apr. 20, , Sept. 2, 08 ¥) 99 100 19031902 190618971907 H. R 143,900 Concrete Steel 101 IM 11 368212
. Concrete bridges and culverts, for both railroads and highways . 84 N., Dec. 5, 07 85 86 10 I10 I 3636 19001900 Jeup N., Apr. 11, , Apr. 11, 01. 8788 89 2:66 90 9 I 3^ 8 36121218241212 1902 18951905 54,000 Concrete Steel Co.,Von .. , Mar. 17, 07 R., Feb. 13, 04 N., Oct. 3, 91 92P3 3x1 1905R. H. R Sept 22 06 «)4 Hibbard R Feb. 10 06 95 Kahn 96 %4x% 190619071901 H. 25,680 National Bridge Co. q? 98 N., Aug. 1, , Apr. 20, , Sept. 2, 08 ¥) 99 100 19031902 190618971907 H. R 143,900 Concrete Steel 101 IM 11 3682124 102 103 8i 77,0005,640 13,90075,000 Burr Dean N., May 9. 07 .R., Dec. 10, 98 . 1041051C6 4^Frame 19031 1904 F. H. Courtright Brady N., Mav 12, , ,, Apr. 6, 05 . £0 107108 1U9 6 I 36 110 E. R. 111 ?4 612 12 1902 12,600 112 ^ 1907E. H. Luten 113 114 H J . 115 N., Oct. 19, 99 116 ^1 12 468 1302 H. 1900: Luten 117 VT 118 5-8 H. 119 .... 120 <• 121 1905 R. R. 12,000 , Sept. 2, 08. 122 —B. E r J80 PART III. Highway Beam Bridges. Comparison of Arch and Beam. The advantages»f arch bridges have already been described in-^art I of this bools, and original formulae have3een given from which the approximate cost ofioncrete bridges may be determined. One of thediief merits of arch bridges is that when properlylesigned, they may be made beautiful in outline. Some of the advantages of beam bridges are asollows:—(1) It is possible in a beam bridge tooeate the grade of the bridge floor much lower andlearer to the high water level or other clearanceine than can be done when an arch is used; (2)oundations for beam bridges may be built on soilhat is more or less yielding, which cannot be doneivitli arch bridges, unless hinges are used at the^enter and spring. The lateral thrust of arches on>oft foundations is liable to cause serious injury to:he structure, Avhile the corresponding amount ofsettlement under the abut
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