Hints to Travellers Volume 1; Scientific and General by Royal Geographical Society
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Author: Royal Geographical Society
Number of Pages: 90 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231235263
File size: 36 Mb
Download Link: Hints to Travellers Volume 1; Scientific and General
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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. 1906 Excerpt: ...angle of elevation or depression to the forward station. When great accuracy is not required, traverse tables may be used in working out the distances, but these do not usually read near enough to give exact results, and when much interpolation has to be done, it takes very little longer to compute by logarithms, which is accurate. The error on the closing point of a theodolite traverse can be distributed graphically, as shown on p. 166, or computed and distributed proportionately by the following rule: --Bule for Distributing the Closing Error of a Theodolite Traverse.--Correction for the error on the closing point in a traverse when the first and last stations are mutually visible from each other, can be made as described in 'The Text-Book of Topographical and Geographical Surveying, ' as follows: --Suppose the legs of the traverse together with the line A B form an enclosed figure, then the sum of all the interior angles should be equal to twice as many right angles as the figure has sides, less four right angles. We thus have a check on the observed horizontal angles. lt should be carefully noted that the included angles at the stations are always measured, either all to the right or all to the left of the back station. 1f necessary they must be reduced to these, which can easily be done by taking the differences between the angles to the forward stations if they are not directly measured. For instance, in the traverse shown on p. 148, the interior angle A B C is clearly equal to 180o--(Zt B C--Z A B), reckoning these two latter angles as measured round to the right, and so with the others. ln the case of Fig. 60 the angles are all measured to the left of the back station. The sum of all the interior angles then should be equal to (2n x 90--360) degrees, w...
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