principal meridian


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principal meridian

One of the imaginary lines running north and south,used as references for the public land survey system. There are 37 principal meridians in the United States. Each one has a name, and the names are used to distinguish the various surveys that eventually made up the public land survey system.

References in periodicals archive ?
00D will be the principal meridian with the higher absolute BVP, so as that is less than 3.
Therefore, the user must be aware of the importance of considering both principal meridian powers.
This well was drilled in Section 23-14 Township 152, Range 101 West, 5th Principal Meridian and immediately east (less than 2,500') in Sections 24 and 13, the company owns mineral rights which have been leased to Oasis Petroleum.
Some practitioners believe that steepening the Back Optic Zone Radius (BOZR), to a new value a third, or halfway, between the principal meridians, will create a more stable fitting lens, however, research tends to suggest that this is not a creditable method.
Patients who have difference in principal meridians from keratometer readings greater than 0.

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