Hydrographical surveying : a description of means and methods employed in constructing marine charts (1920)
Wharton, W. J. L. (William James Lloyd), 1843-1905, Field, Arthur Mostyn, 1855- · London : J. Murray · leaf 192
hod, so called in contradistinction to the method of pro-traction by three circles already explained under StationPointer. The three Figmes 47- 49 give the three possible positions ofthe objects, viz. : When the observer is inside the triangle CHAP, v.] CALCULATING POSITION, ETC. 171 formed by the… … is most probable, the calculation of the second formula willbe unnecessary. Let A B C be the objects observed. X the position ofobserver to be determined. AB = c, BC = a, AC = &, are thesides known, A X B = m and B X C = w, the angles observed.Required X A and the angle B A X. At A, in A C,…
Hydrographic surveying · Nautical charts
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