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  2. Grading (earthworks) - Wikipedia

    en.wikipedia.org/wiki/Grading_(earthworks)

    Section through railway track and foundation showing the sub-grade. Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage.

  3. Workman Publishing Company - Wikipedia

    en.wikipedia.org/wiki/Workman_Publishing_Company

    From the beginning Workman focused on publishing adult and children's non-fiction, and its titles and brands rank among the best-known in their fields, including: the What to Expect pregnancy and childcare guide; the educational series, Brain Quest and The Big Fat Notebooks; travel books like 1,000 Places to See Before You Die and Atlas Obscura ...

  4. Square (tool) - Wikipedia

    en.wikipedia.org/wiki/Square_(tool)

    Squares can be checked for accuracy against a known reference, such as a square or piece of machinery that is known to be accurate or against a cylindrical square. A bright light or feeler gauges can be used to check for gaps between the square and the object being referenced. Through symmetry squares can also be checked against themselves.

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  6. Machinist square - Wikipedia

    en.wikipedia.org/wiki/Machinist_square

    Simple method for checking a low grade square against itself. The simplest method of checking a low grade square for accuracy is to draw a line across a board with a flat face and straight edge (illustrated). Then flip the square over 180 degrees and check if the blade aligns with the line just drawn.

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