Philosophical Transactions of the Royal Society of London; Giving Some Accounts of the Present Undertakings, Studies, and Labours, of the Ingenious, in Many Considerable Parts of the World Volume N . 150

Philosophical Transactions of the Royal Society of London; Giving Some Accounts of the Present Undertakings, Studies, and Labours, of the Ingenious, in Many Considerable Parts of the World Volume N . 150

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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. 1861 edition. Excerpt: ... the passage to Holyhead, with some trifling rough weather, still shows a diminution of force, and tendency to the fore-and-aft direction of the neutral points of disturbance: the former is reduced from 0480 to 0390, or about one-sixth (the corresponding semicircular deviation being 28 45' and 23 0'); and the latter changed 5, or from 37 to 32. The changes denoted by the mast and platform compasses do not follow the same progressive decrease and change of direction of ship's force. To the less perfect observations of the mast-compass, arising from the difficulty of obtaining readings aloft, and from the friction of blunted pivots after a few weeks' wear and tear, can be traced the probable causes for this instrument; the unfavourable but unavoidable position for the platform compass has been adverted to. The quadrantal deviations of all the compasses show a decrease, so far confirmatory of the law that exists in the numerous vessels reviewed; but there is an anomaly detected by Mr. Amy in the quadrantal disturbance of the Admiralty Standard compass worthy of record, viz. that it is larger in the quadrant from west to north; the position opposite to that in which the ship was built. 1st, or 2nd, 3rd, 4th, N.E. quadrant. S.E. S.W. N.W. River Thames.. +4 33-2 46 +1 8--3 6 Portland.... +4 38-3 8 +4 53-6 37 Indication of rapid changes in the ship's magnetism was also given by the ship's established standard compass, which had been compensated on the passage down the river Thames (from the known direction of the ship's head by astronomical bearings), and deemed by the gentlemen engaged for the purpose as correct. At Portland, with head in the N.W. direction, it had 7 error on the second day at that anchorage. Communicated in a letter to Mr. Bundell, ...show more

Product details

  • Paperback | 224 pages
  • 189 x 246 x 12mm | 408g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123662727X
  • 9781236627278