Science Fair Project Encyclopedia
Ballast pond
Wooden ships used to have their hulls waterproofed using tar. To facilitate the application of tar below the waterline, shipyards built a square ballast pond in shallow water with an entrance port on one side. A ship would enter the ballast pond and be tied to one wall. Then on the low tide, the ship would lean on one side to allow the tarring. On the next tide, the ship would be tied to the opposite wall to complete the job.
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details