Elements of Plane Trigonometry, Surveying and Navigation

Elements of Plane Trigonometry, Surveying and Navigation

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1855 edition. Excerpt: ... the prominent objects to be determined, as roads, buildings, fences, &c.; and placing signals at the points best adapted to form the principal stations of the survey. In the figure let it be supposed that the points A, B, and C can be seen from each other, as also the points A, B, and D; and that nothing prevents the measurement of the lines AB, BC, &c. which join these points. Signals are placed at the points A, B, C, and D, to mark the primary stations of the survey. The work is commenced with the measurement of the line AC, for example, from which offsets are made to the river, or other prominent objects situated near to this line. At d near the road a signal is left for a secondary station in filling up the survey. Measuring next the line CB, offsets are again made to the river and other prominent objects near this line; and a signal is left at n on this line to mark another secondary station. In like manner the remaining lines joining the primary stations, are measured; and offsets to the prominent ob jects near them determined. Signals are also left at such points upon them as will best serve for secondary stations in filling in the work. The work connected with the primary lines of the survey being thus performed, the surveyor proceeds next to measure the lines which join the secondary stations, making offsets from these also to such objects near them, as it may be required to notice in the survey. Returning to d, for example, the line dn joining the stations d and n is measured, a signal being left at m for a new secondary station; and so on. The work is thus carried on, until all the details are filled in, and the whole is completed. 133. The field book may be kept in the following manner. Each page is divided into three parts...show more

Product details

  • Paperback | 56 pages
  • 189 x 246 x 3mm | 118g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123651064X
  • 9781236510648