An account of the methods used to describe lines, on Dr. Halley's chart of the terraqueous globe ; shewing the variation of the magnetic needle about the year 1756, in all the known seas ; their application and use in correcting the longitude at sea ; with some occasional observations relating thereto / [William Mountaine].

  • Mountaine, William, active 1736-1778.
Date:
[1757]
Catalogue details

Licence: Public Domain Mark

Credit: An account of the methods used to describe lines, on Dr. Halley's chart of the terraqueous globe ; shewing the variation of the magnetic needle about the year 1756, in all the known seas ; their application and use in correcting the longitude at sea ; with some occasional observations relating thereto / [William Mountaine]. Source: Wellcome Collection.

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    [ *5 ] ed in his faid Book, fundry Tables of the Variation, as obferved by himfelf, Petrus Plancius and others; for which vide Pages 72, 73, in the 1 ft Part, Pages 93, &c. in the 2d Part, and Pages 6 and 7 in the Appendix. As this Book has been many Years out of Print, and confequent- ly but in few Hands; the following Obfervations of the Variation extracted from the faid Tables, and a few others, may not be un¬ acceptable to the curious Navigator. Near London at Limehoufe.... About Portland At Scilly From Cape Lizard S. by W. 8 Leagues At Tonga11 in Ireland -- ■■ -- At Fay all, on a medium ...... . . —»- Hard by Flores, or betwixt it and Fayall From Flores Eaftward 70 or 80 Leagues Crofting the Meridian of Flores and Corvo -- At Cape Finifier-- At the Canaries-- -- Riding at Anchor near Cape Blanco ■ ■ — At Cape Verde At the IOand of Trinidada --— In the Meridian of Barbadoes, in Latitude I4d. 20m. North----- 1 At Cape Florida —----- At the I Hand of Afcenfi.n ——---—- At St. Helena, on a Medium-— -— ~—- At the lfland of Lnjtian Acunha —--- At the eaft Mouth, or Entrance into Magellans 7 Straits —----3 About Cape Bona Efperance, in Latitude 35 — 02 In the Ifle of Mozambique----— At the Maldives Ifiands- At Zeylon--——-- At Bantam in Java, on a Medium ->- In the life of IVaigatz --- —--- — At North Cape----— At Antwerp in Brabant — '—- Variation ood. °om7 E 11 30 10 OO Eaft 10 CO Eaft 12 50 Eaft 10 OO Eaft 03 °5 Eaft 00 co 00 00 01 OO Weft 08 30 Eaft °5 37 Eaft 03 OO Eaft °7 OO Eaft 00 OO CO OO. °3 OO Weft 10 00 Weft 04 55 Eaft >9 00 Eaft 05 3° Eaft 02 00 Eaft 12 00 Eaft 00 Eaft 15 3° Eaft 04 45 Eaft 07 00 Weft 01 00 Weft °9- 00 Eaft From a fcarce Book, entifuled the New Attractive*, a Difcourfe of the declining or dipping. Needle, firft found by Robert Norma-?, . ' Hydor