. Railroad structures and estimates . tNo. lin. ft. of culvert pipe req. 1510 1610 1710 1810 1910 57 60 63 66 69 16 4 17 4 18 4 19 4 20 4 57 6 60 62 6 65 67 6 17 0 18 0 19 0 20 0 21 0 57 6 60 62 6 65 70 20i072 21 472 622 072 6 211075 22 47523 0 221078 23 477 624 077 6 243036 Ht. from base of rail to invertNo. lin. ft. of culvert pipe from base of rail to invertNo. lin. ft. of culvert pipe from base of rail to invertNo. lin. ft. of culvert pipe req. 2310 2410 2510 2610 2710 81 84 87 90 93 24 4 25 4 26 4 27 4 28 4 80 82 6 87 5 90 92 6 25 0 26 0 27 0 28 0 29 0 80 85 87 6 90 92 6 2

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. Railroad structures and estimates . tNo. lin. ft. of culvert pipe req. 1510 1610 1710 1810 1910 57 60 63 66 69 16 4 17 4 18 4 19 4 20 4 57 6 60 62 6 65 67 6 17 0 18 0 19 0 20 0 21 0 57 6 60 62 6 65 70 20i072 21 472 622 072 6 211075 22 47523 0 221078 23 477 624 077 6 243036 Ht. from base of rail to invertNo. lin. ft. of culvert pipe from base of rail to invertNo. lin. ft. of culvert pipe from base of rail to invertNo. lin. ft. of culvert pipe req. 2310 2410 2510 2610 2710 81 84 87 90 93 24 4 25 4 26 4 27 4 28 4 80 82 6 87 5 90 92 6 25 0 26 0 27 0 28 0 29 0 80 85 87 6 90 92 6 281096 29 495 30 095 29109930 4 97 6 3010102 MATERIAL REQUIRED FOR MORTAR FOR 100 JOINTS OF PIPE. For 24 diam. is required 3 bbl. cement and cu. yd. 30 diam. is required 4 bbl. cement and cu. yd. 36 diam. is required 6 bbl. cement and cu. yd. sand. BILL OF RIP-RAP AT TWO ENDS. For 24 pipe is required 4 cu. 30 pipe is required 5 cu. 36 pipe is required 6 cu. yd. TRIANGULAR CONCRETE PIPE. 141. ^■-2 0-H 24 CONCRETE CULVERTSECTION i«-iA|«-iV»;

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