,
, we find the experimental value of
to equal
exactly for a height of sand of 2.5 ft., the value at 6 ft. and upward being 0.33.
The theory of bin pressure is utterly different from the ordinary theory of earth pressure in an unlimited granular mass; but it is seen that the latter may be of some use in furnishing a value of
when experimental values are lacking, as in the case of various kinds of earth, both granular and more or less consolidated.