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The Military Map (Additional Chapters); Elements of Modern Topography (French School of War): (English)

The Military Map (Additional Chapters); Elements of Modern Topography (French School of War): (English)

          
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About the Book

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. 1917 Excerpt: ...gradient of a slope represented on a map of known scale by a certain serrage (compression of the contours). In practice, when dealing with scales of say from 1/50,000 to 1/200,000, the graphic equidistance usually adopted is of a millimetre or of a millimetre, according to the denominator of the scale. The one is chosen that makes the real or natural equidistance a round number of metres. Map-makers have been led to adopt the above value for e in this way. It is important to make the real or natural equidistance as small as possible; for the closer together are the horizontal planes that determine the contours the better will be the representation of the ground. On the other hand, there is for each scale a limit to the proximity of these planes which one cannot exceed. It must be possible to give the contours the compression (serrage) proper to the steepest slopes. If we take an incline of 45 or gradient of as being the steepest slope that it is necessary to represent by contours, the formula g= shows us that the distance between two adjacent contours for that extreme slope is exactly equal to the graphic equidistance. And it does not seem possible in practice to give the contours a smaller separation than or of a millimetre. Where slopes exceed one in one the contour lines are discontinued and replaced by the sign for escarpments. This sign consists of a hachured effect that becomes more irregular and disordered the more nearly the escarpment to be represented approaches to a precipice. Occasionally in very flat districts the value of e may be reduced by half, in order that the ground should be better denned; and, on the contrary, it may be doubled in very mountainous districts, so as to avoid an excessive darkening of the map that would make it les...


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Product Details
  • ISBN-13: 9781236137289
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Series Title: English
  • Weight: 68 gr
  • ISBN-10: 1236137280
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 189 mm


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