Excerpt from Elements of Plane Trigonometry, Surveying and Navigation
When this is not the case, some error must have occurred, either in the survey or the plotting. If not found in the latter, it should be sought in the field. Such lines and angles being first re-measured, in which it is most probable the error has occurred.
The reverse bearing may be taken, as we proceed, as a test of the accuracy of the direct bearing.
In the present example it r...
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