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 180
se main points as zeros which will give the least change inthe angle due to any small movement of the ship whilst theangles are being taken. Example XIX.—Triangulation of a strait with good naturalobjects, by means of the ship under way and one theodolitestation on shore. The method illustrated by… … If there are three or four observers on board the ship, themain angles may be taken simultaneously, and the ship neednot anchor. A very large area may thus be rapidly triangu-lated, its limitation being practically determined by the dis- 160 HYDROGRAPHICAL SURVEYING [chap. v. tance at wliich the…
Hydrographic surveying · Nautical charts
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