If either of the errors exceed 2 links for every 10 chains in the sum of the distances, a re-survey ought to be taken: but if the errors are within these limits, they may be corrected as directed in the rule*.

Note 2. When one side of the ground is rough and hilly, it is very probable the measured distance of that side will be too great; therefore if the errors in latitude and departure would both be lessened by lessening the latitude and departure corresponding to that side, it would be proper to deduct a few links from the distance and take out the latitude and departure again, previous to calculating and applying the corrections.

Note 3. Each of the numbers in the column of meridian distances is the sum of two adjacent meridian distances; but to avoid the too frequent repetition of the word sum, it is denominated simply a meridian distance.

EXAMPLE 1.

The following field-notes are given to find the area of the survey.

* The directions given in the rule, for correcting the errors in difference of latitude and departure are deduced from the rule given and demonstrated in No. 4, of the Analyst, by Nathaniel Bowditch, and also by the editor Robert

In the above example the meridian distances are found by adding the eastings and subtracting the westings. By beginning at the 5th station, and adding the westings and subtracting the eastings, the same answer would be obtained.

corrections the sum was found to be .16 only, instead of .17; this is .04 was therefore placed for the correction, but on adding up the *The first correction of departure is rather nearer .04 than 05;

EXAMPLE 3.

Required the area of a tract of land bounded as follows: 1st. N 75° E, 13.70 ch. ; 2nd, N 20° E, 10.30 ch.; Srd. East, 16.20 ch.; 4th. S 33°W, 35.30 ch.; 5th. S 76°. W, 16 h.; 6th. North, 9 ch.; 7th. S 84° W, 11 60 ch. ; 8th. N 53° W, 11.60 ch; 9th, N 36°, 19.36 ch.; 10th. N 22° E, 14 ch.; 11th. S 76° E, 12 ch.; 12th. S 15° W. 10.85 ch.; 13th. S 18° W, 10.62 ch. to the place of beginning.