This report shows an example of methods to obtain some comparatively great amounts of deformation in proportion to additional forces over a wide range of large forces. For this purpose an apparatus is devised which consists of a pressing rod and a cylindrical vessel in which sand mass is contained in the form of a column.
When the column of sand in the cylindrical vessel is compressed by the rod whose diameter is different from the vessel's, under some optimum conditions an applied force per unit cross sectional area of the rod is linearly proportion to an amount of deformation or depression of the column over a wide range of large forces. These optimum conditions are decided in section 8 in Results.
A methed to get a large amount of depression is devised and is named ''Series Connection Method" or ''Piling up Method" which is to pile up many apparatuses above mentioned one upon another.