. Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States .. . Fig. 52. 1 1 ■ 1 h^^^HBH ^■IH Fig. 53. HBd^BI 105. The formation of tables for the amount of earth inlevel cutting is very Fig. 54. simple. The areaof the following sec-tion, where B is thebase, and R the hor-izontal dimension ofthe slope, is ^ 2 X ^ ^^ 2 ^. or finally B±rxh, % 100 HANDBOOK OP RAILROAD CONSTRUCTION. i. e., the base of a rectangle by its height. Multi
. Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States .. . Fig. 52. 1 1 ■ 1 h^^^HBH ^■IH Fig. 53. HBd^BI 105. The formation of tables for the amount of earth inlevel cutting is very Fig. 54. simple. The areaof the following sec-tion, where B is thebase, and R the hor-izontal dimension ofthe slope, is ^ 2 X ^ ^^ 2 ^. or finally B±rxh, % 100 HANDBOOK OP RAILROAD CONSTRUCTION. i. e., the base of a rectangle by its height. Multiply this by100 and divide the product by 27 ; or divide by tVo? and wehave the cubic amount in a prism one hundred feet road-bed being nineteen feet wide, and slopes one anda half to one, the formula for the amount of a prism onehundred feet long is (19+ 11 A) and assuming the base of rock cutting as eigiiteen feet,and slope one quarter to one, and embankment eighteenfeet at subgrade, we have, rock, (72 -\-h) and embankment. (18-f-l|A) ■ the figiu-e being inverted for embankment. For a prismof ten or of one thousand feet in length, we have only tomove the decimal point. In forming a table, proceed asfollows: — h B+l^h B-^\\h X h B-\-l\ a b c d o V c d a i <f fP*. EARTHWORK. 101 It is evident from inspection of fig. 55, that c exceeds c° Fig. 55.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroadsdesignandco
