The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 312
the boat cannot be stoppedlong enough to read two sextant angles, two sextants aresometimes used with one observer, he setting both angles andreading them afterwards ; or two observers may be employedin the same boat and the angles taken simultaneously. 229. By one Range and one Angle.—The range… … shore. If buoys are used they must be located by triangulationfrom the shore stations. A triangulation system along a rockyor wooded coast may consist of one line of sta-tions on shore and a corresponding line of buoys.The angles are read only from the shore stations,two angles in each triangle…
Surveying
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