k proves that the leak must concrete copingof the dock being blasted out for this all have taken place at the damaged apron; and it purpose. The three walls is safetosay that when the of piling were then braced by a system of 13^-inch tie present repairs are com- pleted. Naval Constructor bolts and… … 4.-C0FFERDAM ACROSS ENTRANCE CHANNEL-DRY DOCK No. 3, BROOKLYN NAVY YARD. ) 1897 SCIENTIFIC AMERICAN, INC.
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