. Their weights are laid off as before, on the line,
, of [Fig. 25], and the further construction is exactly as there indicated. It is assumed here that the slope of
does not exceed the natural slope, for, if it does, the construction is somewhat altered.
It may be asked whether the construction of [Fig. 25], where the cohesion on the vertical planes,
, etc., is omitted, if applied to the experiments on rotating boards, will appreciably alter the results given in [Table 3]. The answer is no; for, when
,