A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 156
roduce that line to the circumference in D,which is the point of observation. Join AD, BD. The angleADB is the sum of the observed angles, and AEB added to itmust make 180°. The Trigonometrical Analysis.— In the triangle ABE, we havethe side AB and all the angles, AE and EB can therefore be… … 154 SURVEYING. When the bearing of the base line on shore is known, as it gen-erally is, and the bearings to its extremities, or even to one extrem-ity, are taken, the triangle is known at once. A pilot guides a vessel in and out of a port by ranging lines onthe shore, minutely or approximately, as…
Surveying · Navigation
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