Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 444
ne purposes, for the foundations p^^. j^^oq of lighthouses, or anchors for buoys where they resist the upward motion of the waves. As they are sunk withoutjar or disturbance of the soil, they are adapted to positions where the neigh-bouring structure mighl be injured by other methods of sinking… … 428 ENGINEERING DRAWING. The sand surface beneath the blocks was exposed to the action of strongjets, and the mixture of sand and water was pumped up by centrifugal pumps;the suction-pipe nozzle was just below the level t)t the bottom of the block ;care was taken that the quantity of water forced…
Mechanical drawing
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