A Voyage of Discovery; Made Under the Orders of the Admiralty, in His Majesty's Ships Isabella and Alexander, for the Purpose of Exploring Baffin's

A Voyage of Discovery; Made Under the Orders of the Admiralty, in His Majesty's Ships Isabella and Alexander, for the Purpose of Exploring Baffin's

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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. 1819 edition. Excerpt: ...of bearings between the ship's head and the point of change--Increasing 10 45 True variation, --72 15 W. This rule was found subsequently not to be applicable in all cases. 2d. On the 19th of June, with the ship's head N.E., the '. variation Observed on board O / was---, --64 20 W, Difference of bearings between the ship's head and point of change--Decreasing-8 00 True variation, 72 20 W. It is evident, that azimuths taken on each point will have the same effect, and therefore no example is required. It is, .however, necessary to observe, that this point of change was calculated from the compasses in the binnacle, which agreed with the azimuth compasses placed amidships, half way between the mizen-mast and capstan; but the point of change may be altered by setting the compasses in any other position in the ship; and particularly by shifting them from midships to the side. Finding the point of change thus subject to alteration, by changing the position jof the compasses, and the angle of deviation itself materially affected by heat and cold, as well as by the bumidity and density of the atmosphere; to obviate these difficulties, a binnacle was constructed to stand always exactly in the spot above mentioned, and fitted with a funnel for the conveyance of heated air, that an equal degree of temperature might be preserved within it-The temperature was above the freezing point during the time that all the foregoing experiments and observations were made. EXPERIMENTS AND OBSERVATIONS MADE ON BOARD H. M. S. ISABELLA, IN JULY, 1818. A Flag-staff was erected upon the highest part of the Three Islands, in lat.740 1' 15" N. and long. 57 45' W.; from whence the exact bearing was taken by Kater's compass, of a remarkable spot on a sugar-loaf mountain, nine...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236485394
  • 9781236485397