A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 168
ivided circle moves: while,then, the north point of the box is moving towards the east,the north point of the needle will traverse it towards theivest. In order, then, that the index should not only pointto the number of degrees, but also show the cardinal points Sec. L] DEFINITIONS AND INSTRUMENTS… … north, and the south point the magnetic south; the pointmidway between these to the right is east. The line from Cto C is therefore south of east. If then the north point of theneedle is to be used as the index, it should be found betweenthe letters S. and E. The bearing in the figure is S. 80° E.…
Surveying
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