as closed I entire dock. The present floor of the apron will be the guide piles were out of line, blocking had to be in- for supplying the 18,000 yards required by using the ripped up, the three or four feet of concrete which un- serted or notches cut in the guide wales and the piles mud excavated… … 3.-CR0SS SECTION THROUGH COFFERDAM. service of the navy yard. wales and well spiked both 4.-C0FFERDAM ACROSS ENTRANCE CHANNEL-DRY DOCK No. 3, BROOKLYN NAVY YARD. ) 1897 SCIENTIFIC AMERICAN, INC.
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