. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . tile drains for subsurface drainage, all to be putin during original construction. (See Fig. 43.) Some of thehighest grade specifications call for the removal of the top layerof vegetable soil from cuts and from under proposed fills tosome convenient place, from which it may be afterwards spreadon the slopes, thus facilitating the formation of sod from grass-seed. But while engineers favor these measures and theireconomic value may be readily demonstrated, it is generallyimpossi
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . tile drains for subsurface drainage, all to be putin during original construction. (See Fig. 43.) Some of thehighest grade specifications call for the removal of the top layerof vegetable soil from cuts and from under proposed fills tosome convenient place, from which it may be afterwards spreadon the slopes, thus facilitating the formation of sod from grass-seed. But while engineers favor these measures and theireconomic value may be readily demonstrated, it is generallyimpossible to obtain the authorization of such specificationsfrom railroad directors and promoters. The addition to theoriginal cost of the roadbed is considerable, but is by no meansas great as the capitalized value of the extra cost of mainte-nance resulting from the usual practice. Fig. 43 is a copy of 72 RAILROAD CONSTRUCTION. §65. designs * presented at a convention of the Ameiican Society ofCivil Engineers by Mr. D. J. Whittemore, Past President ofthe Society and Chief Engineer of the Chi., Mil. & St. Paul. PROPOSED SECTION OF ROADBED ON EMBANKMENT* GRAVEL^
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1913
