Synopses & Reviews
Synopsis
Excerpt from Methods for the Computation of Triangulation on the Grid System
Suppose the instrument has been set up at a known-point, and a set of readings has been taken on several other points, both known and unknown. The Y-azimuth from the instrument to each of the other known points may be computed, by means of Equation 1. From any one of these Y-azimuths the Y-azimuth to one of the unknown observed points may be determined by means of the angle observed between the known point and the unknown point. It is, however, more convenient to compute first the Y-azimuth of the imaginary direction which would have been sighted if the instrument had read zero, -that is, the Y-azimuth of Z ro. Or V-zero. Then the Y-azimuth of any desired direction, on which the reading of the instrument was R, is obtained, if the instrument used is graduated clockwise, by adding R to V-zero.
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