Abstract
Author has been interested in moisture movement in unsaturated soils, and investigated this problem.
Through these investigations, author used many tensiometers for measuring soil moisture tension, and felt it very necessary to equip the most proper apparatus and, espesially, porous cup for each purpose.
So, auther made such apparatuses and cups, and in the process, could get some experiences and knowledge concerning the following problems.
1) Easy production of porous cups in laboratory.
2) Methods of testing porous cups.
3) Some methods of measuring tension by tensiometer, especially on advantages and disadvantages of null method and normal method.
4) Analysis on the problem of, time lag acompanying normal method measurement.
(Theoretical equation for adjusting time lag proposed by author was examined by experiment and proved to be correct.)
