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  2. Lead-based paint in the United States - Wikipedia

    en.wikipedia.org/wiki/Lead-based_paint_in_the...

    The District of Columbia defines "lead-based paint" as any "paint, surface coating that contains lead equal to or exceeding 0.7 milligram per square centimeter (0.7 mg/cm2) or 0.5% by weight." [9] This is more stringent than the HUD lead-based paint standard of 1.0 mg/cm2) . Some states have adopted this or similar definitions of "lead-based ...

  3. Masonry - Wikipedia

    en.wikipedia.org/wiki/Masonry

    A mason laying a brick on top of the mortar Bridge over the Isábena river in the Monastery of Santa María de Obarra, masonry construction with stones. Masonry is the craft of building a structure with brick, stone, or similar material, including mortar plastering which are often laid in, bound, and pasted together by mortar.

  4. Grain per gallon - Wikipedia

    en.wikipedia.org/wiki/Grain_per_gallon

    The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm). Also called Clark degree (in terms of an imperial gallon).

  5. Quoin - Wikipedia

    en.wikipedia.org/wiki/Quoin

    Quoins (/ k ɔɪ n / or / k w ɔɪ n /) are masonry blocks at the corner of a wall. [1] Some are structural, providing strength for a wall made with inferior stone or rubble , [ 2 ] while others merely add aesthetic detail to a corner. [ 3 ]

  6. Peter Lowe (artist) - Wikipedia

    en.wikipedia.org/wiki/Peter_Lowe_(artist)

    Peter Lowe (born 17 June 1938) is an English artist, born in Hackney, London. His work is systematic, constructivist and concrete. His work is systematic, constructivist and concrete. It is mainly exhibited and appreciated in Europe, where it is held in many national collections.

  7. National Museum of African American History and Culture

    en.wikipedia.org/wiki/National_Museum_of_African...

    The museum is located at a low point on the Mall, and groundwater puts 27.78 psi (191.5 kPa) on the walls. To compensate, 85 US gal (320 L) per minute of water were pumped out every day during construction of the foundation and below-grade walls, and a slurry of cement and sand injected into forms to stabilize the site. Lasers continually ...