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  2. Slave ship - Wikipedia

    en.wikipedia.org/wiki/Slave_ship

    A plan of the British slave ship Brookes, showing how 454 slaves were accommodated on board after the Slave Trade Act 1788.This same ship had reportedly carried as many as 609 slaves and was 267 tons burden, making 2.3 slaves per ton. [1]

  3. Caisson (lock gate) - Wikipedia

    en.wikipedia.org/wiki/Caisson_(lock_gate)

    A caisson is a form of lock gate. It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to float it and allow it to be towed clear of the dock. Graving docks at Birkenhead, closed by a variety of ship caissons and floating (sliding) caissons.

  4. Shipbuilding in the American colonies - Wikipedia

    en.wikipedia.org/wiki/Shipbuilding_in_the...

    The Atlantic triangular trade formed a major component of the colonial American economy, involving Europe, Africa and the Americas.The primary component of the transatlantic triangular trade consisted of slave ships from Europe sailing to Africa loaded with manufactured goods; once the ships arrived at African shores, the European slavers would exchange the goods aboard their ships for ...

  5. Caisson lock - Wikipedia

    en.wikipedia.org/wiki/Caisson_lock

    Caisson lock. The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower ...

  6. Tetrapod (structure) - Wikipedia

    en.wikipedia.org/wiki/Tetrapod_(structure)

    Tetrapod (structure) Tetrapods protecting a marina on Crete, Greece. A tetrapod is a form of wave-dissipating concrete block used to prevent erosion caused by weather and longshore drift, primarily to enforce coastal structures such as seawalls and breakwaters. Tetrapods are made of concrete, and use a tetrahedral shape to dissipate the force ...

  7. Glossary of nautical terms (A–L) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_nautical_terms...

    AAW An acronym for anti-aircraft warfare. aback (of a sail) Filled by the wind on the opposite side to the one normally used to move the vessel forward.On a square-rigged ship, any of the square sails can be braced round to be aback, the purpose of which may be to reduce speed (such as when a ship-of-the-line is keeping station with others), to heave to, or to assist moving the ship's head ...

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