Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 241
andsince n is 3 feet above ra, thesecond plane will cut the lineran in a point s determined bythe proportion ran : ras : : 3 : 2.In like manner the points t, q,and r are determined. The irregular line tsp qr represents the intersection of the second horizontal plane with the surface of the… … Fig 49. CHAPTER V.RAILROAD SURVEYING. § 37. General Remarks. When the general route of a railroad has been determined,a middle surface line is run with the transit. A profile of thisline is determined, as in § 34. The levelling stations are com-monly 1 chain (100 feet) apart. Places of different…
Trigonometry · Surveying · Navigation
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