Engineering and Contracting . n the work of construction, I have adoptedit for all sizes of culverts. The minimum grade on whichculverts should be placed should be .35 per cent. (9) That it will not be necessary to rivet the sheets Weight of Spacing Length metal per Clear span d. of rails. lin. ft. of Ft. In. In. Ft. In. culvert, lb 22 0 3 2 fi 6 3 3 n |_ Double 2 3 4 11 f 2 0 6 2 6 2 6 5 3 0 3 0 4 3 fi { 4 0 3 4 6 r 2 0 6 2 6 2 6 6 3 11 3 0 6 3 fi 4 0 5 4 6 ENGINEERINGAND CON-TRACTING at each joint buf provide laps of IVa corrugations a
Engineering and Contracting . n the work of construction, I have adoptedit for all sizes of culverts. The minimum grade on whichculverts should be placed should be .35 per cent. (9) That it will not be necessary to rivet the sheets Weight of Spacing Length metal per Clear span d. of rails. lin. ft. of Ft. In. In. Ft. In. culvert, lb 22 0 3 2 fi 6 3 3 n |_ Double 2 3 4 11 f 2 0 6 2 6 2 6 5 3 0 3 0 4 3 fi { 4 0 3 4 6 r 2 0 6 2 6 2 6 6 3 11 3 0 6 3 fi 4 0 5 4 6 ENGINEERINGAND CON-TRACTING at each joint buf provide laps of IVa corrugations andrivet all intersecting wings where the same miter in. (10) That the upper or intake end of the culvertshould be made about 6 in. greater in width than the mainportion in order to aid the entrance of the water and toeflfect the working of the culvert to its capacity. (11) That the angle iron supporting the arch ironneed not be of the same purity as the light iron of thearch, but should be protected by at least two coats of a. Fig. 3—Construction Views of Flat Arch Corrugated Iron Culverts. good preservative paint, for instance, a first coat of RedLead Lute and a second or finish coat of Carbon Black A, both of which are manufactured by the Lowe Bros,of Dayton, 0., or the angle might well be protected bycovering it with a liquid or mushy grout before plac-ing the arch iron thereon, which would completelyembed it and thus protect it from the action ofthe water; or the angle might be galvanized; any oneof the above being ample to protect it against cor-rosion indefinitely, especially if the plaster coat and thecement grout are applied properly, as the water will beprevented from following down the iron on to the fact, it would take years of corrosion even if the anglewere unprotected to cause any serious effects, owing tothe fact that the only portion of the angle required for thearch is that part entirely covered by the iron of the is therefore my pers
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