Prodromus of a practical treatise on the mathematical arts: containing directions for surveying and engineering (1838)
Eaton, Amos, 1776-1842 · Troy, N.Y., E. Gates; New York, Robinson, Pratt & co., [etc., etc.] · leaf 202
g ordinate D C from the ordinate c 7i, and theremainder will be that part of the ordinate which is above the chordline B C. Proceed in the same manner with v s, and all othermeasures on the diameter line E D, moving 5 feet at a time alongsaid line. In this manner all the offset lines (called… … 190 For sections 224, 225 and 226. In taking the cross areas of excavations and enibanhnents, it isgenerally preferable, when very irregular, to suppose the base andsurface level, and of course, parallel, however uneven they may bein reality. Then add their calculated lengths, halve their sum,…
Surveying · Civil engineering
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