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 91
(112.) Conversely. The distancemay be obtained when the heightis known. Let C B be a known height:Then, AC= CB. tan. ABC. 72 LEVELLING, TOPOGKAPHY, AND HIGHER SURVEYING. B C is a known height, and D E aninaccessible line in the same horizontal Bplane as C. Find CD and C E bythe last method, and… … PART III.BAROMETRIC LEVELLING CHAPTER I. PRINCIPLES AND FORMULAS. (113.) Principles. The difference of the heights of twoplaces may be determined by finding the difference of theirdepths below the top of the atmosphere in the same way asthe comparative heights of ground under water are determinedby…
Surveying
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