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2. Liftboat - Wikipedia

   en.wikipedia.org/wiki/Liftboat

   The liftboat Kaitlyn Eymard was built in the US by Conrad Industries in 2002. A liftboat is a self-propelled, self-elevating vessel used in support of various offshore mineral exploration and production or offshore construction activities. A liftboat has a relatively large open deck to accommodate equipment and supplies, and the capability of ...

3. Chesapeake and Ohio Canal - Wikipedia

   en.wikipedia.org/wiki/Chesapeake_and_Ohio_Canal

   The 1917 video "Down the Old Potomac (Part 1 of 3)" shows the canal during its operating days. Some of the information is inaccurate. For example, it says that "barges" (more correctly "boats") passed through 86 locks descending 800 feet to tidewater; in fact, there were 77 locks descending 610 feet.

4. Porte-class gate vessel - Wikipedia

   en.wikipedia.org/wiki/Porte-class_gate_vessel

   The Porte-class gate vessels were a class of five boom defence vessels built in the early 1950s and operated by the Royal Canadian Navy (RCN) and Canadian Forces (CF) during the Cold War. The class derived its name from the gates of the French fortifications of Québec and Louisbourg and was designed by the RCN as a replacement for World War I ...

5. Peterborough Lift Lock - Wikipedia

   en.wikipedia.org/wiki/Peterborough_Lift_Lock

   The Peterborough Lift Lock is a boat lift located on the Trent Canal in the city of Peterborough, Ontario, Canada, and is Lock 21 on the Trent-Severn Waterway. For many years, the lock's dual lifts were the highest hydraulic boat lifts in the world, raising boats 65 ft (20 m). This was a considerable accomplishment in the first years of the ...

6. Lock (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Lock_(water_navigation)

   A gate is opened to allow a boat to enter or leave the chamber; when closed, the gate is watertight. A set of lock gear to empty or fill the chamber as required. This is usually a simple valve (traditionally, a flat panel (paddle) lifted by manually winding a rack and pinion mechanism) which allows water to drain into or out of the chamber. [11]

7. Abraham Lincoln's patent - Wikipedia

   en.wikipedia.org/wiki/Abraham_Lincoln's_patent

   Abraham Lincoln's patent relates to an invention to buoy and lift boats over shoals and obstructions in a river. Abraham Lincoln conceived the invention when on two occasions the boat on which he traveled got hung up on obstructions. Lincoln's device was composed of large bellows attached to the sides of a boat that were expandable due to air ...