A Guide Book to the Local Marine Board Examination; The Ordinary Examination

A Guide Book to the Local Marine Board Examination; The Ordinary Examination

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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. 1875 edition. Excerpt: ... the nearest dotted lines, then to return to the central line--keep the first leg of the dividers fixed and lift the other off the curve, move in a direction parallel to the plain lines until you reach the central line, the point where the dividers cut the central shows the correct magnetic course. Examples. Ex. 1. The course steered by standard compass is N.N.E.: what is the correct magnetic course to lay down on the chart (using the curve C in the diagram, Plate I.) Find the given compass course N.N.E. on the central line, then take a pair of dividers, put one leg of the dividers on N.N.E., from which extend the other leg along the dotted line passing through the point till the curve is reached, then keeping the leg on the central fixed, move the one off the curve, and then return to the central line in a direction parallel to the plain line; it will be found to intersect it at N. 13J" E., or N. by E. E., nearly, the required correct magnetic course. Ex. 2. The course steered by compass is N.E. by N.: required the correct magnetic course (using curve A, Plate I.) Follow the dotted line extending from N.E. by N. to where the curve cuts it, by placing one leg of a pair of dividers on the course found on the central line and the other at the point where the dotted passing through N.E. by N. cuts the curve, then keeping the leg on the central line fixed, lift the other from the curve and move in the direction of the nearest plain lines till the central line is reached; then the correct magnetic course will be found to be N. 5J E., or N.E. E., nearly. Ex. 3. The course steered is S.S.W.: required the correct magnetic course (using curve C, Plate I.) Having found the compass course S.S.W. on the vertical line, place one leg of the dividers on...show more

Product details

  • Paperback | 130 pages
  • 189 x 246 x 7mm | 245g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236607368
  • 9781236607362