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 263
ons. 203. Adaptation of Formulae to Inclined Sights.—Theprevious discussion is applicable to horizontal sights only. 232 SURVEYING. If the rod be held on the top of a hill, and the telescopepointed towards it, the reading on the rod will give the lineardistance from instrument to rod, provided the… … Fig. 62. increased in the ratio of i to the cos of the angle with thehorizon. Thus, the space AB (Fig. 62) for the rod perpendicularto the line of sight becomes AB for the rod vertical. ButAB ^ABcosv.^ Let AB = r, the reading on the stadia for perpendicularposition; and Let AB = r, the actual…
Surveying
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