Standard penetration test 2 [SA-02]
You can understand the drilling process used by the moat ground muddy back in this content, mixed with anhydrous digging up spring-fed layers and bentonite by muddy water moat. Has added non-bentonite mixtures into the muddy water is a feature of this ハンドルマン (operator).
Boring machine with slide unit-based.
You can see the standard penetration test because it are using semi-automatic fall コーンプーリー law except automatic fall at a prescribed height drive hammer mechanism. Hand not exam ｃｍ 50, intervals are fishing sample to study on liquefaction at the scene alone.