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A Mathematical Manual

A Mathematical Manual


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About the Book

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. 1728 Excerpt: ...Weft is 10 Degrees from London (as by the Bottom of the Map) or the Longitude is 9 Degrees Eaftward from Ferro, one of the Canary Iflands. 6. Having thus far fliewed the Defcription of the feveral forts of Maps, and alfo to find the Latitude and Longitude by them, I proceed to fhew how;, fj j, .::: " c- r'i I-..l: -, -jj uiij1: ': ." %o find the Dijlance between Places by right "J," " liitd MAP S. I..: ... -.'.............':: .J.-., -Ai i.;jlj)--'.. '.: i... '......'..: .?;...'.. ' Rule. This is very eafily done; For if yovt take with a Pair of Compafles the Diftance be-tween the 2 Places, and. apply that to one Side of your Map, it will give the Number of Degrees and Minutes; which Degrees, multiplied by 70, exhibit the Number of Miles. And if there be any Minutes, they are lb many"-'; there ore they mod be multiplied by 7, and divided by 6.. ': .. l.-" 7. Now the Reafon why we multiply the Degrees by 70, to give the Miles in any Number of Degrees, is, becaufe Mr. Norwood, by actual Meafuring, found, that a Degree upon the SurfaceofV.the' Earth did contain 69 f Englijh Statute Miles, of. 1760 Yards each. So a Degree in round Numbers, without any confiderable Error, may be called 70 Miles. Note alfo, The Reafbn why the Minutes, when there are any, are to be multiplied by 7, and divided by 6, is, becaufe there are 60 Minutes in a Degree, equal to 70 Miles. Therefore, As As 60 Minutes is to 70 Miles j fo is any Minute to its Miles. As fuppofe I would know the Miles in 30. Minutes, 'tis thus: x 60: 70:: 30: 35 Or, omitting the Cyphers in each of the two firft, ., 6 '" 7:: ..3: .35 Which is half of 70, as 30 is of 60. And here I think it may be proper to give the Proportion of Englijh to other Country Miles and Degrees. t...


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Product Details
  • ISBN-13: 9781231324370
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1231324376
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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