A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 152
If it blows obliquely, the correction will be itsvelocity multiplied by the cosine of the angle which the direc-tion of the wind makes with the direction of the sound. 2. By measuring with the sextant the angular height ofthe mast of a vessel, then we have : Distance = height of mast -f- tan. of… … anchored at various points between A and B, and thus newbase lines be formed, from the ends of which to triangulate topoints on the shore. CHAPTER II. SOUNDINGS. (209.) In a river or narrow water, the soundings may betaken in zigzag lines, from shore to shore, at equal intervalsof time, as in Fig.…
Surveying
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