Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.

Photographer: Bill Coughlin
Taken: April 15, 2009
Caption: Dry Dock #1: How it Works
Additional Description: 1. The large gate at the harbor end of the dry dock is a caisson, partially filled with water. The dry dock is filled with sea water by opening pipes through the caisson which allow water to flow from the harbor into the dry dock.

2. Water is pumped out of the caisson, allowing it to float and be towed away.

3. A ship is brought in and lined up above keel blocks.

4. The caisson is replaced and flooded to seal the end of the dry dock. The water in the dry dock is pumped out, and the ship is left cradled and dry.
Submitted: April 30, 2009, by Bill Coughlin of Woodland Park, New Jersey.
Database Locator Identification Number: p61439
File Size: 1.012 Megabytes

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