and
or ½, were found to differ from computed values only 2, 3, 0, and 1% for the different cases, which should give confidence in the general conclusions, at least.
The diagram, [Fig. 11], with a slight modification, can be utilized to find the coefficient of cohesion,
, at which the bank of earth will stand without a retaining board. Thus, let each line, as
, representing the cohesive force acting along its proper plane, be extended to meet the corresponding
