A single open ended testing cylinder which is attached to wireline probe instrumented head is positioned at the lower end of a conventional hollow-stem drilling auger which is penetrated into the soil therebelow. During testing cylinder is rotated in the soil while torsional loading is measured and axial loading bypassed.

Un solo cilindro de prueba terminado abierto que se une a la cabeza equipada punta de prueba del wireline se coloca en el extremo inferior de un taladro que perfora del hueco-va'stago convencional que se penetra en el therebelow del suelo. Durante la prueba el cilindro se rota en el suelo mientras que se mide el cargamento torsional y el cargamento axial puenteado.