Elements of surveying and levelling; with descriptions of the instruments and the necessary tables (1870)
Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes & Company · leaf 249
remarked here, is designated as aminus cutting in the field-notes. The second and fourth columns are for the horizontal andvertical measurements of the cross section. The examples following will illustrate the method of meas-uring the section and recording the notes. Let figure represent a section… … The level being set up and adjusted in a convenient place,the rod is first held by the centre stake at C, and a readingtaken. In the present example, the reading is 5.4. The line ABforms a convenient datum line, and the height of the instru-ment above this line, is evidently 12.4 + 5.4 = 17.8 ft.…
Surveying
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