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3-in.-diameter undisturbed sand 5-in.-diameter angle of taper area ratio bore hole borings drilled bottom clean cohesionless soils CONE CLAMP containing the samples cup auger cutting edge diameter drill rods drilling mud expanding packer Field density determinations fishtail bit Flow control valve ground-water table hydraulic drive system hydrostatic pressure laboratory leather cup packing length of drive length of sample measured and recorded methods and equipment Mississippi River obtaining undisturbed samples penetration resistance piston rod extension piston sampler ple tube procedure project investigations rate of penetration rod extension pipes rod screw clamp rotating sample from depth sample increment sample transportation rack sample tubes containing sampler drive sampler head sampler piston samples of sand sampling equipment sampling method sampling operations shown in figure slice split-cone-clamp assembly THREADS PER INCH top stratum transporting samples tube during withdrawal undisturbed sand sample uniform rate unit weight determinations viscosity water table Waterways Experiment Station