A Treatise on Surveying, Comprising the Theory and the Practice Volume 1

A Treatise on Surveying, Comprising the Theory and the Practice Volume 1

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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. 1912 edition. Excerpt: ...A and C, 150." In column form, this becomes Between A150 and C. At!B When the vernier had been set at zero before sighting to the first object, and other objects were then sighted to, those objects, the readings to which were less than 180, will be on the left of the first line, and those to which the readings were more than 180 will be on its right, looking in the direction in which the survey is proceeding, from A to B, and so on. In surveying a farm, the angle of deflection at station, or the traverse angle, may be noted, together with the lengths of the courses. 332. To repeat an Angle. Begin as in Art. 329, and measure the angle as there directed. Then unclamp below, and turn the circle around till the telescope is again directed to the first object, and made to bisect it precisely by the lower tangent.screw. Then unclamp above and turn the vernier.plate till the telescope again points to the second object, the first reading remaining unchanged. The angle will now have been measured a second time, but on a part of the circle adjoining that on which it was first measured, the second arc beginning, where the first ended. The difference between the first and last readings will therefore be twice the angle. This operation may be repeated a third, a fourth, or any number of times, always turning the telescope back to the first object by the lower movement (so as to start with the reading at which the preceding observation left off), and turning it to the second object by the upper movement. Take the difference of the first and last readings and divide by the number of observations. The advantage of this method is that the errors of observation (i. e., sighting sometimes to the right and sometimes to the left of the true point) balance each...show more

Product details

  • Paperback | 130 pages
  • 189 x 246 x 7mm | 245g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236560639
  • 9781236560636