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A.S.T.M. specifications aggregates analysis results Anthony Falls apparatus application of Stokes approximately assumed behavior Bouyoucos Brownian motion Brownian movement calculated Casagrande l93l Chapter chemical Chu and Davidson clay particles clay soils colloidal concen concentration conclusions convective disturbances defined deflocculation degree of dispersion density depth of sampling disc effect ellipsoids equation error experimental fall velocity flocculation fluid formula grams per liter Herdan l953 hydraulic engineering hydrogen peroxide hydrometer method hydrometer reading influence investigations kaolinite Krumbein Malaika material McNown measurements mentation montmorillonite observed obtained orientation particle shape particle thickness particle-size analysis particle-size determination percentage values pipette pointed present Professor Casagrande pycnometer range recommended relative Reynolds number sedi sedimentation analyses sedimentation cylinder sedimentation diameter settling velocity shearing strength shown silt and clay sodium sodium tripolyphosphate soils engineering specific gravity sphere spherical standard A.S.T.M. suspension medium temperature theoretical ticle tion ultrasonic varies velocity of fall viscosity water film Wintermyer writer believes