Engineering and Contracting . start-ing, due to additional surface under fric-tion: Pile Periodof Number of Blows 1st 6 of Re driving. 3 Penetration at begin-- ning ofRedriving. 18 5007-2 3 2 24 500G-1 3% 4 24 5005-4 172 6 32 5001-1 142% 10 33 5003-3 141 10 34 5002-2 2131/4 13 W 5004-4 172% 13 39 The first 6 ins. of redriving correspondsto the nearly horizontal portion of theheavy line of the diagram and includesthe number of blows shown in the table. Penetration seems to have influenced theresistance to redriving more than the timethe piles were allowed to rest. As
Engineering and Contracting . start-ing, due to additional surface under fric-tion: Pile Periodof Number of Blows 1st 6 of Re driving. 3 Penetration at begin-- ning ofRedriving. 18 5007-2 3 2 24 500G-1 3% 4 24 5005-4 172 6 32 5001-1 142% 10 33 5003-3 141 10 34 5002-2 2131/4 13 W 5004-4 172% 13 39 The first 6 ins. of redriving correspondsto the nearly horizontal portion of theheavy line of the diagram and includesthe number of blows shown in the table. Penetration seems to have influenced theresistance to redriving more than the timethe piles were allowed to rest. As above mentioned, the piles weredriven in pairs, and all within an area 50-X 80 ft.; the pairs are indicated by thefigure following the pile number. In driv-ing, pairs showed the same characteristicswhile passing through similar strata. The writer does not attempt to drawconclusions or formulate a theory. Thesimple facts are given and the resultsstated, but it is thought that much may belearned by a careful study of the EngContr Fig. 3—Diagram Showing the Action of a Pair of Piles While Being Driven. of 30,400 lbs. was then applied, and at tneend of the next 24 hours the total settle-ment amounted to ft., which gradu-ally increased to ft., 10 days after thefirst load was applied; this amount didnot increase up to 25 days, at which timethe whole load was removed and the pilefound to have returned to the position itwas in when the first load was put on. .At the sluices in the Cambridge coffer-dam 8 test piles w^re driven in pairs, thepiles in each pair being about 3 ft. apart ginning of the fall of the hammer; a sec-ond called the reading at the end of thefall, which also gave the elevation of thebutt of the pile, from which that of thetip was determined; a third man recordedthe readings of the first two; a fourth manwas engaged with a stop-watch in keepingthe actual driving time, while the fifth keptthe total time, noted the rise or fall of thetide, the verti
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