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  2. French drain - Wikipedia

    en.wikipedia.org/wiki/French_drain

    A diagram of a traditional French drain. A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.

  3. Tile drainage - Wikipedia

    en.wikipedia.org/wiki/Tile_drainage

    Water enters the tile line either via the gaps between tile sections, in the case of older tile designs, or through small perforations in modern plastic tile. [9] The installation of the tiles or tile line can involve a trencher ( Ditch Witch ), a mole plough , a backhoe , or other heavy equipment .

  4. Weep (architecture) - Wikipedia

    en.wikipedia.org/wiki/Weep_(architecture)

    Another type of weep is a tube that can be made formed by using hollow plastic or metal. The spacing between the tubes is about 16 inches (41 cm) apart. The installation of the tubes are done at angle to allow water to drip out. If the angle is too steep, the opening hole inside the wall cavity will be too high for water to come out.

  5. Board foot - Wikipedia

    en.wikipedia.org/wiki/Board_foot

    The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada [1]. It equals the volume of a board that is one foot (30.5 cm) in length, one foot in width, and one inch (2.54 cm) in thickness, or exactly 2.359 737 216 liters .

  6. Exterior algebra - Wikipedia

    en.wikipedia.org/wiki/Exterior_algebra

    The exterior algebra is the direct sum of the -th exterior powers of , and this makes the exterior algebra a graded algebra. The exterior algebra is universal in the sense that every equation that relates elements of V {\displaystyle V} in the exterior algebra is also valid in every associative algebra that contains V {\displaystyle V} and in ...

  7. Salix 'Chrysocoma' - Wikipedia

    en.wikipedia.org/wiki/Salix_'Chrysocoma'

    Salix × sepulcralis 'Chrysocoma', or Weeping Golden Willow, is the most popular and widely grown weeping tree in the warm temperate regions of the world. It is an artificial hybrid between S. alba 'Vitellina' and S. babylonica. The first parent provides the frost hardiness and the golden shoots and the second parent the strong weeping habit.

  8. Lion Monument - Wikipedia

    en.wikipedia.org/wiki/Lion_Monument

    The Lion Monument (German: Löwendenkmal), or the Lion of Lucerne, is a rock relief in Lucerne, Switzerland, designed by Bertel Thorvaldsen and hewn in 1820–21 by Lukas Ahorn.

  9. Great Slave Auction - Wikipedia

    en.wikipedia.org/wiki/Great_Slave_Auction

    Pierce Mease Butler, whose slaves were sold in the auction, and his wife, Frances Kemble Butler, c. 1855 The Great Slave Auction (also called the Weeping Time [1]) was an auction of enslaved Americans of African descent held at Ten Broeck Race Course, near Savannah, Georgia, United States, on March 2 and 3, 1859.

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