Practical Geodesy

Practical Geodesy

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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. 1842 edition. Excerpt: ...to jth of the contained arc; the greater number of these corrections, however, oscillating between th and-fatt. It is evident, therefore, that, for terrestrial refraction, it is impossible to generalize a formula in the present state of knowledge; and extreme cases of extraordinary refraction have been mentioned which no previous calculations could have prepared the observer to guard against. When tracing out the base on Hounslow Heath, General Roy had directed the telescope fixed at King's Arbour towards Hampton Poor House, "at which end of the base a flag-staff had been erected; this, for a long time, he endeavoured in vain to discover, till at last, very unexpectedly, it suddenly started up into view, and so high it seemed to be lifted, that the surface of the ground where it stood became visible. This will appear the more extraordinary, when it is considered K that a right line drawn from the eye of the observer at King's Arbour to the other end of the base, would pass 8 or 9 feet below the surface of the intermediate ground." "On the same base line, 30 pickets had been driven 100 feet from each other, so that their heads appeared through the telescope to be in a right line: this was done in the afternoon. The following morning proved uncommonly dewy, and the sun shone bright; when having occasion to replace the telescope, it was remarked that the heads of the pickets exhibited a curve concave upwards: in the afternoon, when the ebullition in the air subsided, the curve appearance was lost." Example lf The distance between Maker Heights and Kit Hill Stations, in the eastern part of Cornwall, was computed at 67822 feet. On Maker Heights, the ground at Kit Hill, elev. 29' 45" At Kit Hill, the ground at Maker Heights, ...show more

Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236599160
  • 9781236599162