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Topographical Drawing and Sketching Volume 1-2; Including Applications of Photography

Topographical Drawing and Sketching Volume 1-2; Including Applications of Photography


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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. 1886 Excerpt: ...slopes. The intensities of shade so produced conform to the scale, and a true representation of the configuration can thus be obtained. If irregular slopes intervene between these curves of equal shade, the shades corresponding to them are capable of exact determination as follows: Let fa be such a slope; the shade value required is fa + fa + fa, and shades 3, 2 and 1 are correspondingly superposed. As a ready means of obtaining these different values the following table is prepared: To find the shade value for a slope of fj, look under "shade values" for next higher scale value = ff, and add together the least number of " superposed shades," on the same horizontal line, that will produce-=----g;or the required shade is produced by the superposition of 5, 3, 2, and 1. It is observed that a slope of 450 is represented by the superposition of all the shades. The result, although darker than No. 6, is by no means black; in fact, all the shades produced form simply a parallel series having certain relative values, as in many other forms of scales of shade. d. The next step is to trace the curves of equal shade upon the contoured map, which is readily effected from the consideration that the slope along a normal between adjacent contours is uniform, and that normals of equal length between adjacent contours indicate equal degrees of declivity. Thus, in Fig. 65 the normals n, n, being of equal length mark slopes of equal declivity about the watercourse ab, and the dotted line drawn through their middle points is a curve of equal shade. The points ri and ri are located approximately as follows: ri is evidently between c and d; and since the inclination is less rapid from the middle point of cd towards c than toward d, ri will be nearer the lowe...


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Product Details
  • ISBN-13: 9781130103991
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 70
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130103994
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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