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Home > Medicine & Health Science textbooks > Medicine: general issues > History of medicine > The Mariner's Compass Rectified; Containing Tables Shewing the True Hour of the Day, the Sun Being Upon Any Point of the Compass
The Mariner's Compass Rectified; Containing Tables Shewing the True Hour of the Day, the Sun Being Upon Any Point of the Compass

The Mariner's Compass Rectified; Containing Tables Shewing the True Hour of the Day, the Sun Being Upon Any Point of the Compass


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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. 1781 Excerpt: ...horizon. If you meet with any difficulty in finding the red image of the fun turn the fcreen back, and the fun's image will be fo bright you cannot mifs it; and you may then put the fcreen in its proper place again. Having brought the image down near to the horizon, fwing the octant backwards and forwards, making your eye the centre of motion, moving the index forward at the fame time, 'till the lower limb ef the fun juft fweers the horizon, and you will have the apparent altitude of the fun's lower limb upon the arch of the quadrant at that inftant. But the meridian, or greatefr. altitude, is that, from which the latitude is to be determined, which is exactly at noon or 12 o'clock. Now if you have fet your watch, as directed in the ufe of the tables of dials, and you have not failed conliderably to the Eaftward or Weftward, you may know exactly when to take the meridian altitude. But fuppofing you have failed a degree directly Eaft or Weft, it will make out 4 minutes difference between your watch and the fun, and much time may be favcd in waiting to obferve thegreatefl altitude; befides your inftrument will not lie fo long roafting and warping in the fun upon the hen-coop, or on.the drum-head of the capftan, as is too commonly the cafe. Having found the apparent altitude of the fun's lower limb, the following corrections mutt be applied. Firft. The index error, if any. to be added or fubtracted, as taught in the third correction of the inftrument. Secondly. The dip of the horizon. Thirdly. The fun's femidiameter. Thefe three corrections give the apparent altitude of the fun's centre, to which apply the correction for refraction, and you will have the true altitude of the fun's centre very nearly, the correction for the fun s parallax being fo fmall, that i...


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Product Details
  • ISBN-13: 9781232057598
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1232057592
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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