IK the vertical cross-section of a wall, the re-entrant angles, formed by the steps in which the footing of the wall is built, generally lie upon a straight line. The investigation set forth in the following Paper is an attempt to determine the slope of that line for varying conditions. The theoretical cross-section of an unsymmetrical footing for a wall subjected to horizontal thrust, and the reaction of the soil on the underside of the footing, are represented diagrammatically in
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