a quarter in breadth, and of a length depending upon the space available, is raised in level. On each side of this bed two trenches (R R, Fig. 171) are dug in the following manner. A line is stretched in position, and along the line lumps of earth are taken up with a spade, and laid in a row by the… … Fig. 171. Fig. 172. Fig. 170. — View from Above. Fig. 171. — End View. Fig. 172. — Side ^^iew. soil taken from the trenches, and if necessary from elsewhere ; when well rammed down and dressed this forms the foot of the hack P. On this foot the bricks are arranged in open-work hacks, the bricks…
