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 156
Example lY.—Tivo inaccessible objects visible from three posi-tions which are invisible from each other. In Fig. 27, G, 0, W are three stations lying more or less ina meridional direction, but invisible from each other, thelatitudes of which have been accurately determined, and fromeach of which…
Hydrographic surveying · Nautical charts
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