A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 508
ines havingthe opposite bearings, and their intersection will be the requiredpoint. This is rapid and easy, but not precise. 731. From the Boat with the Sextant. Observe with the sextantto three signals on shore, noting the two angles. Two observers,or one observer with two sextants, are necessary.… … from one of these points to a second one, and soundings taken atregular intervals of time between them. The distance apart of the soundings depends on the regularityof the bottom, the depth of the water, and the object of the sur-vey. Care should be taken to leave no spot unexplored. For great…
Surveying
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