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 62
r independently. In taking cross-levels wherethe slopes are quite steep, as in mountain districts, frequentsettings of the instrument are necessary. A much more rapid method is by the use of cross-sec- DIFFICULTIES. 43 tion rods. These are two rods, one of which is about ten ortwelve feet long,… … Aslope-level is sometimes used. See Angular Survey-ing, Part II. CHAPTEK YII. DIFFICULTIES. (67.) Steep Slopes. In descending or ascending a hill, theinstrument and the rod should be so placed that the sightshould strike as near as possible to the bottom of the rod onthe up-hill side, and the top…
Surveying
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