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2. Yard (sailing) - Wikipedia

   en.wikipedia.org/wiki/Yard_(sailing)

   The yard exists to allow square sails to be set to drive the ship. The top edge of the sail is 'bent on' (attached) to the yard semi-permanently. Clewlines and buntlines are led along the yard and from there to the mast and down to the deck. These allow the bottom of the sail to be hoisted up to the yard, so the sail is effectively folded in two.

3. List of boat lifts - Wikipedia

   en.wikipedia.org/wiki/List_of_boat_lifts

   Geheyan dam boat lift, also in Hubei Province, capable of lifting vessels of 300 tons displacement. The dam was completed in 1994, but technical difficulties delayed the opening of the ship lift for four more years. Longtan dam boat lift, capacity to lift vessels of 250 tons, in a basin 40×10.8×1.8 meters, and a vertical lift of 68.5 meters. [2]

4. Float (nautical) - Wikipedia

   en.wikipedia.org/wiki/Float_(nautical)

   A pontoon boat is a flattish boat that relies on nautical floats for buoyancy. Common boat designs are a catamaran with two pontoons, or a trimaran with three. [2] In many parts of the world, pontoon boats are used as small vehicle ferries to cross rivers and lakes. [3] An anchored raft-like platform used for diving, often referred to as a pontoon

5. Robert Gaskin - Wikipedia

   en.wikipedia.org/wiki/Robert_Gaskin

   However, a lift pontoon failed as the Gaskin was reaching the surface. [3] The Gaskin sank again, this time landing close enough to the Armstrong that the salvage of the Gaskin would have needed to be completed before salvage of the Armstrong could continue. The final attempt to raise the Gaskin occurred on 25 November 1889.

6. Auxiliary floating drydock - Wikipedia

   en.wikipedia.org/wiki/Auxiliary_floating_drydock

   Sections could be put together to lift larger ships. AFDB were needed to repair battleships, aircraft carriers, cruisers, and large auxiliary ships. The AFDB-1 Artisan had 10 sections (A to J) for a total lift of 100,000 tons, and was 1,000 ft (300 m) long with all 10 sections installed. AFDB-1 to 7 were built between 1943 and 1945 and towed to ...

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 ...