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Restoration of Lost Corners by Proportionate Measurement
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  Irregular Boundary Adjustment and the Compass Rule Adjustment

With an irregular exterior adjustments parallel to the direction of the line or made just like a single proportionate problem. Knowing this, complete the formula using this information."D" stands for total record departure. "A" stands for record departure of one course, you should have noted that D1 the departure of the closing error is to D, the sum of the record departures, as A1 the adjustment in departure is to A, the record departure of that course.

But we must use another basic rule, the Compass Rule, when calculating adjustments perpendicular to the direction of an irregular boundary line. Knowing this, complete the formula. Here the C's designate course lengths not departure and C1 is to C the total length of the courses as L1, the adjustment in latitude is to L, the latitude of the closing error. The thing to remember with regular boundary adjustments is that parallel to the line you used single-proportion, latitudes and departures, but perpendicular to the line you use the Compass Rule which measure course length rather than cardinal equivalents.

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