Root's Military Topography and Sketching, Prepared for Use in the United States Infantry and Cavalry School

Root's Military Topography and Sketching, Prepared for Use in the United States Infantry and Cavalry School

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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. 1902 edition. Excerpt: ... open whole-circle protractor, which can be centered over the station and properly oriented. The opening being greater than the longest side shot, a ruler, with a scale on its edge, has its 0 pivoted on the station and is revolved around to the different azimuths, and the distances laid off at once without drawing any lines. Another method is by using a semi-circular protractor numbered in the reverse direction to the graduations of the horizontal limb. The diameter edge is graduated to the scale of the map and numbered each way from the center. The center is pivoted over the station. With this protractor, the direction of any point is given by the diameter when the azimuth number on the protractor coincides with the meridian through the station. The distance is laid off on the scale on the diameter. To orient the protractor at any forward station, the center is placed on the station. the diameter on the line joining the back station, and a dot marked at the azimuth reading will be a point on the meridian from which all azimuths at that station are measured. Details. The side shots having been plotted, the details which they are to locate and the contours are then completed. If there is any doubt about these, the map should be taken to the ground and the contours sketched in, after points on them have been located by interpolation, as already explained. Filling In With Plans Table.--The telescopic alidade with stadia wires, and stadia rods, are used with the plane table for traversing and "filling in" details in a manner similar to what has been explained for the transit. The table with the attached sheet is analogous to the graduated horizontal limb of the transit. The traversing with and orienting the table have been explained. At any...show more

Product details

  • Paperback | 104 pages
  • 189 x 246 x 6mm | 200g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236576594
  • 9781236576590