een dredged, great difficulty was experienced in driving the inches in diameter in the middle and upper walings. Cast piles, and in the two dams in question one sixth of the whole iron washers, 9 inches in diameter and 24 inches thick, were number pitched, having shown symptoms of failure, were… … walings. To avoid the difficulty of having to procure a num- needed, as the water which gathered when the tide was high ber of long timbers, the piles were in a few cases only of the | W5 passed through sluices at low water. Murray’s chain full length required, and the others, after being driven,…
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