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7adjoining the inside of the wall, towards the mass of ground, teeth similar to those of a saw are constructed, each of which projects from the wall a distance equal to the height of the foundations, and their thickness is to be equal to that of the foundation wall. An extent equal to the height of the foundations is taken at the outer angles, and marked by points on each side; and through these a diagonal is drawn, on which a wall is carried up, and from the middle of this another is attached to the angle of the wall. The teeth and diagonal walls being thus constructed, will discharge the weight of earth from the wall, by distributing its pressure over a large surface.
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