The (=mei of a rectangular area at ground surface has Cartesian coordinates (0,0), and the corners have coordinates (6, 15). MI dimensions are in metres. the area carries a uniform pressure of 150 kPa. Estimate the stresses at a depth of 20 m below ground surface at each of the following locations: (0,0), (0, 15), (6,0), (6, 15), and (10,25); obtain values by both Boussinesq and Westergaard methods, and also determine the ratio of the stresses as indicated by the two methods. (After Taylor, 1948.)