Elements of Plane Trigonometry, Surveying and Navigation (Classic Reprint) - Hardcover

William Smyth

9780484121293: Elements of Plane Trigonometry, Surveying and Navigation (Classic Reprint)

Hardcover

ISBN 10: 0484121294 ISBN 13: 9780484121293

Publisher: Forgotten Books, 2020

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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 remains only to mark on the plot the place of the tower referred to in the remarks. In order to this, at Awe lay off to the right an angle equal to the bear~ ing, of the tower at that station, and through this angle draw an indefinite line. We next at the station D lay off to the left an angle equal to the bearing 50� of the tower from that station, and through this angle draw an indefinite line intersecting the former. The point of intersection of the two lines will be the place of the tower on the plot.

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