A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 102
edful when using thetheodolite to take angles of depression, and also when usingthe transit to trace a line that bends backwards and for-wards, the angle of deflection being then generally taken,and recorded to the right or to the left, as the case may be. 180. Double Verniers. To avoid the… … The arc in this figure is divided into degrees, and elevenspaces on the arc are equal to twelve on the vernier: thereading is therefore to 5 minutes. When the figures on thearc increase to the right, the right-hand vernier is used, andvice versa. The reading on the figure is 2° 45 to the left. 181.…
Surveying
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