Buy Tractatus de Globis Et Eorum Usu Volume 79, PT. 1 by Clements Robert Markham
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Tractatus de Globis Et Eorum Usu Volume 79, PT. 1

Tractatus de Globis Et Eorum Usu Volume 79, PT. 1


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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. 1889 Excerpt: ...therefore there is no need to be taken to them either, who conceive that there might be some certaine way found out of calculating the longitudes of places by means of this deflexion of the Needle, which I could wish they were able to performe; and, indeed, it might bee done, were there any certain point it should alwayes respect. But to leave this discourse, let us now see how the quantity of this declination of the Needle may be found out by the use of the Globe, for any place of knowne latitude. And first you must provide you of some instrument by which you may observe the distance of the Suns Azimuth from the situation of a Needle. Our Mariners commonly use a Nautical Compasse, which is divided into three hundred and sixtie degrees, having a thread placed cross wise over the center of the Instrument to cast the shadowes of the Sunne upon the center of the same. This instrument is called by our Mariners the Compasse of variation; and this seemeth to be a very convenient instrument for the same use. But yet I could wish it were made with some more care and accuratenesse then Commonly it is. With this, or the like instrument, you must observe the distance of the Sunnes Azimuth, for any time or place, from the projection of the Magneticall Needle. Now we have before shewed how to find out how much the verticall circle of the Sunne is distant from the true Meridian. And the difference that there is betwixt the distance of the Sunne from the true Meridian, and from the situation of the Needle, is the variation of the Compasse. Besides, we have already shewed how the Amplitude of the rising and the setting of the Sunne may be found. If, therefore, by the helpe of this or the like instrument, it be observed (as we have said) how many degrees the Sunne riseth or...


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Product Details
  • ISBN-13: 9781234990466
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 114
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1234990466
  • Publisher Date: 14 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 218 gr


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