. A manual of the principles and practice of road-making: comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and rail-roads . Line of least Charges of Line of least Charges of resistance. powder. resistance. powder. Feet, inches. Lbs. Oz. Feet. Inches. Lbs. Oz. 1 0 0 0\ 4 2 0 1 6 0 Ij 4 6 2 131 2 0 0 4 5 3 141 2 6 0 7| 6 6 12 3 0 0 13i 7 10 111 3 6 1 ^ 8 J 16 0 The following table will also be found very convenient Diameter of Powder in one Powder in one Depth of hole to contain the hole. inch of hole. foot of hole. one lb. of powder. Inches. L
. A manual of the principles and practice of road-making: comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and rail-roads . Line of least Charges of Line of least Charges of resistance. powder. resistance. powder. Feet, inches. Lbs. Oz. Feet. Inches. Lbs. Oz. 1 0 0 0\ 4 2 0 1 6 0 Ij 4 6 2 131 2 0 0 4 5 3 141 2 6 0 7| 6 6 12 3 0 0 13i 7 10 111 3 6 1 ^ 8 J 16 0 The following table will also be found very convenient Diameter of Powder in one Powder in one Depth of hole to contain the hole. inch of hole. foot of hole. one lb. of powder. Inches. Lbs. Oz. Lbs. Oz. Inches. 1 0 0 1| 0 0 2 0 1 n 0 1 3 0 2 * London Mechanics Magazine, xxxiii. 597, Dec. 1840; and profes-sional papers of Royal Military Engineers, vol. 4. 164 THE CONSTRUCTION OF ROADS. When the rock is stratified, Figf. 77. having beds and seams, as inthe figure, holes bored paral-lel to the joints will producemuch greater effect than theusual vertical ones. When a rocky surface is tobe cut down to a line AB, the holes should be oblique, as Fig.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroa, bookyear1853
