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2. 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.

3. 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.

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. 63 People Share Rules That Were Implemented Because Of One ...

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   Image credits: yourbrainonvape #2 "Students are prohibited from organizing, advertising, playing, observing, or otherwise engaging in any form of rummy, blackjack, Texas Hold 'Em, 5/7 card stud ...

7. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   Modern automatic level in use on a construction site. A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks.

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