Technical Abstract: Concurrence that by accounting for momentum, the Eq. [8] may more accurately reflect the energy transmitted from the sliding hammer to the penetrometer described in Herrick and Jones (2002). We also agree that their new estimate of resistance (Eq.[9]) remains "an experimental measurement which does not give a unique soil property; rather it is a complex measure which depend on bothe the penetrometer and the soil condition (Minasny and McBratney, 2005).