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Lectures on Compass Adjustment (Formerly Given to the Navigating Officers of the Royal Navy)

Lectures on Compass Adjustment (Formerly Given to the Navigating Officers of the Royal Navy)


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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: ... the size of the spheres required and their distance from the compass, while the angle with the athwartships line, through which the spheres must be rotated, is found by halving the angle whose tangent is j-. Thus, in the preceding case, spheres of 12 ins. diameter would be required, placed 9 5 ins. from the centre of the compass to their nearest points, and at an angle of 10 with the athwartships line, the starboard sphere moving forward. The spheres will always be finally secured in some position between athwartships and four points before or abaft the beam, according as E is + or--, in the first case the port sphere moving forwards and vice versa. This arises from the fact that E alone would necessitate placing the spheres in a line at 45" on either bow or quarter, but as D always exists as well as E and is always +, the correction of this also will bring the line of spheres nearer to the midship line than if they w7ere used for correcting E alone. In the theoretical case of a compass having--D (caused by--a being more powerful than--e, or by + e acting with-a, or overpowering + a), the spheres would be placed fore and aft; if, moreover, E was also acting, they would have to be rotated into some position between the fore and aft line and a line from four points on either bow to 45 on either quarter. The action of a soft iron sphere as a quadrantal corrector is best understood when we think of it as a temporary magnet (produced by the induction of the earth) pivotted in such a way that its centre is in the plane of the compass needles and that it always points in the magnetic meridian and also in the line of dip, regardless of the varying direction of the ship's head. Such a temporary magnet is equivalent to two of the same length as the diameter of ...


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Product Details
  • ISBN-13: 9781130727326
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130727327
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr

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Lectures on Compass Adjustment (Formerly Given to the Navigating Officers of the Royal Navy)
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