Journal . umps consisted of 3 plungers 7 by 16 in. stroke, and ran about 20 revolutions per large quantity of sand passed through the pipe and was settledout close to the river side and sold to builders. Owing to lack of slurry the pumps often stopped, and thensand settled in the pipes and had to be washed through withclean water for an hour each night. Mr. Neate also gave the results of two other similar casesin which the pipe was 6 in. diam. and 850 ft. long, and the materialthick and thin cement slurry—chalk mixed with clay. Thesalient features of this diagram were that ev
Journal . umps consisted of 3 plungers 7 by 16 in. stroke, and ran about 20 revolutions per large quantity of sand passed through the pipe and was settledout close to the river side and sold to builders. Owing to lack of slurry the pumps often stopped, and thensand settled in the pipes and had to be washed through withclean water for an hour each night. Mr. Neate also gave the results of two other similar casesin which the pipe was 6 in. diam. and 850 ft. long, and the materialthick and thin cement slurry—chalk mixed with clay. Thesalient features of this diagram were that even this slurry THE PHYSICAL PROPERTIES OF CLAY. 119 (40 per cent, water) behaved like a solid and refused to movetill a pressure of about 35 lb. per sq. in. on a length of 850 6 in. cast iron pipes was reached. When once started, thepressure rose almost exactly in proportion to the velocity up to60 lb. per sq. in., for a velocity of 2-7 ft. per second. FLOW OF CEMENT SLURRY IN^0 FEET OF 6 INCH PIPE. 5ECON D With thicker slurry—about 32 per cent, water—the samesort of results were obtained at very much higher pressures. He pointed out that these results fully corroborated work, and commented from personal inspectionon the very beautiful adaptation of unpromising lookingapparatus to truly scientific uses and accurate results, whichthe author had improvised during his research. Mr. Neate was unable to show at the meeting, but has sincecontributed a sketch of a diagram (Fig. 2) drawn by himwith a horizontally moving pencil on a sheet of paper attachedto a pile (and, therefore, moving vertically with the pile) as ablow was struck. This pile was being driven into clay, and thediagram showed a rebound of nearly half the initial penetration,due for the most part to the elasticity and rebound of the clayin which the pile was embedded. Mr. Neate would also like to add that in his experiencepure chalk slurry with a given percentage of water varies in 120 THE PHYS
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