Manual of Wind Aloft Observations (Wban)

Manual of Wind Aloft Observations (Wban)

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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. 1921 edition. Excerpt: ...on a graveled roof, the point may be marked by setting a small bolt or screw in cement over the point desired. Whenever it becomes necessary to use a platform for observation, a nail may be driven into the planking. Any method whereby the point is permanently marked is acceptable. Whenever it is necessary to do observational work from a platform, the latter will be so constructed that no vibration will be transmitted from it to the theodolite. This is accomplished by building a second platform or support for the theodolite, in such a way that there is a space and no immediate connection between the two. Figure 34 shows a section of such a platform and theodolite stand. Three posts in the form of an equilateral triangle, about 36 inches from center to center, are substantially arranged and rigidly braced. When secured about the observation point, caps for the theodolite foot blocks are placed over the posts in a common horizontal plane. The observation platform is then constructed with the upper surface of flooring flush with the top of the theodolite foot block but not in any way connected with the theodolite stand. A space of at least half an inch should be left between the two. The observation point will be the common center of this equilateral triangular inclosure. As a common center, and along the major axis of the theodolite foot blocks, lay off equal distances from the observation point, and start holes with brace and bit half an inch in diameter to receive the tips of the theodolite legs. Let the holes on each foot block be about 1 inch apart. The size and shape of the platform may be arranged to suit the needs of the station force, but the general scheme above outlined should be followed and the construction made as rigid as possible. Any...show more

Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236485246
  • 9781236485243