1 edition of A discours of the variation of the cumpas, or magneticall needle found in the catalog.
by Imprinted at London for Richard Ballard, and are to be solde at his shop at Sainct Magnus cornar in Themes streate in [London]
Written in English
|Other titles||Discovrs of the variation of the cumpas.|
|Statement||made by W.B. And is to be annexed to The newe attractiue of R.N.|
|Contributions||Norman, Robert, active 1590|
|The Physical Object|
|Number of Pages||60|
Dibner Library copy is imperfect: the title leaf is wanting (A1, supplied instead in handwritten and in photographic facsimile). Part 2, "A discourse of the variation of the compass by William Borough," is also wanting STC (2nd ed.) Dibner Library. Heralds of science ( ed.) S.P. Thompson copy. The Newe Attractive. Containing a Short Discourse of the Magnes or Loadstone: and amongst other his vertues, of a new discovered secret and subtil propertie, concerning the Declining of the Needle. Heereunto are annexed certaine necessary rules for the Arte of Navigation. Newly corrected and amended by M. W. B[orough]. London: E. Allde, for H. Astley,
BOROUGH [Burrough, Burrowe, Borrows], STEVEN (–), English navigator, was born at Northam in Devonshire on the 25th of September In he took part in the expedition which was despatched from the Thames under Sir Hugh Willoughby to look for a northern passage to Cathay and India, serving as master of the “Edward Bonaventure,” on which Richard Chancellor . The Chinese name for the compass is ting-nan-ching, or needle pointing to the south; and a distinguishing mark is fixed on the magnet’s southern pole, as in European compasses upon the northern one.” “The sphere of Chinese navigation,” he tells us (p. ), “is too limited to have afforded experience and observation for forming any.
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Includes original title page: A discours of the variation of the cumpas, or magneticall needle. Wherein is mathematically shewed, the maner of the obseruation, effectes, and application thereof, made by W.B.
And is to be annexed to The newe attractiue of R.N. A discours of the variation of the cumpas, or magneticall needle.: Wherin is mathematically shewed, the maner of the obseruation, effectes, and application thereof, Item PreviewPages: Discours of the variation of the cumpas, or magneticall needle.
Wherin is mathematically shewed, the maner of the observation, effectes, and application thereof, made by W.B. And is to be annexed to the newe attractiue of R.N. Part 2 separate title page reads: A discours of the variation of the cumpas, or magneticall needle.
Wherin is mathematically shewed, the maner of the obseruation, effectes, and application thereof, made by W.B. And is to be annexed to the newe attractiue of R.N. W.B. = William Borough.
In he published A Discourse Mathematical on the Variation of the Magneticall Needle stating that the declination had changed by more than 7° in 54 years. The reality of geomagnetic secular variation was rapidly accepted in England, where Gellibrand had a high reputation, but in other countries it was met with skepticism until it was.
Part 2 has a separate title page; register is not 2 separate title page reads: A discours of the variation of the cumpas, or magneticall needle. Wherin is mathematically shewed, the maner of the obseruation, effectes, and application thereof, made by W.B.
The simplest compass is a magnetized metal needle mounted in such a way that it can spin freely. (You can make one yourself by magnetizing an ordinary needle, placing it carefully on a slice of cork, and letting the cork float A discours of the variation of the cumpas a tray of water.) Left to its own devices, the needle turns until one end points north and the other south.
A Discourse of the Variation of the Compasse, or Magneticall Needle London: E. Allde, for H. Astley, [i.e., ]. Third edition (first, ) of one of the greatest rarities in the entire literature of navigation and magnetism, and “one of the first truly scientific books published in England” (Waters, The Art of Navigation, p.
1. Bent Needle 2. Bent Pivot 3. Sluggish Needle 4. Plane of Sight Not Vertical 5. Electrically Charge Compass Box 6. Local Attraction 7. Magnetic Variation 8. Errors in Reading The Needle 1. Bent Needle -All observed Bearings will have a constant error, Either end of the needle will read higher or lower than the correct value.
A Discourse of the Variation of the Compass, or Magnetical Needle. (Appendix to R. Norman The newe Attractive). London: E Allde for Hugh Astley.
Google Scholar. Gellibrand, H., A Discourse Mathematical on the Variation of the Magneticall Needle. Together with its admirable Diminution lately Search within book.
Type for suggestions. This discovery contradicted the categorical statement of William Gilbert in De magnete that the magnetic variation in a particular place was constant. Gellibrand published his findings in A discourse mathematical of the variation of the magneticall needle together with its admirable diminution lately discovered ().
The direction in which the compass needle points is known as Magnetic North, and the angle between Magnetic North and the True North direction is called magnetic declination or variation.
The magnetic variation throughout Great Britain currently ranges from 2º to 6º. The level of variation changes with location as well as changing annually. A Discourse Mathematical on the Variation of the Magneticall Needle. Together with Its admirable Diminution lately discovered.
London: William Jones, 8 o ( x mm). (Closely trimmed with loss of some headlines and shoulder notes, some browning and pale spotting.). In International Geophysics, Main Features of the Geomagnetic Field. If a magnetic compass needle is weighted so as to swing horizontally, it takes up a definite direction at each place and its deviation from geographical or true north is called the declination (or magnetic variation), D.
In geomagnetic studies D is reckoned positive or negative according as the deviation is east. For general accounts, see E.G.R. Taylor, The Haven-Finding Art: a History of Navigation from Odysseus to Captain Cook (London, ); D.W. Waters, The Art of Navigation in England in Elizabethan and Early Stuart Times (London, ); J.B.
Hewson, A History of the Practice of. Even in the sixteenth century the mariner's compass must have been very crude, for we read in Barlowe's "Navigator's Supply", published in"that in steade of our compas, they use a magneticall needle of sixe ynches long, and longer, upon a pinne in a dish of white china earth filled with water, in the bottome whereof they have two crosse.
"A discourse of the variation of the cumpas, or magneticall needle" by Borough, signed A-G⁴ H², has separate dated divisional title. "A discourse of the variation of the cumpas" identified as STC on UMI microfilm reel ; leaf ¹B1 identified as STC on reel —Borough's book has the title: A Discours of the Variation of the Cumpas, or magneticall Needle.
Wherein is Mathematically shewed, the manner of the obseruation, effectes, and application thereof, made by W. And is to be annexed to The Newe Attractive of R. N., (London). Negative Magnetic Declination or Variation Adjustment If the magnetic declination or variation is negative as shown for the Cape Town area below, clicking OK on the message alert will automatically compensate the compass bearing (29°) by adding the declination value of 24° 30' 36" (°).
In two parts; "A discourse of the variation of the compasse, or magneticall needle" by Borough, has separate dated title page, and is identified as STC at reel Signatures: A-M⁴ A-G⁴ H². Reproduction of original in: New York Public Library. Description: 1. For the facts as known in the thirty years succeeding Gilbert's death, see the remarkable and scarce volume of Gellibrand: A Discourse Mathematical on the Variation of the Magneticall Needle ().
Gilbert's treatise is a skilful literary achievement in which there is no trace to reveal whether any part was written before the rest.Gellibrand’s most widely appreciated scientific discovery, which he should share with John Marr, was that of the secular change in the magnetic variation.
It was announced, without much comment, in A Discourse Mathematical on the Variation of the Magneticall Needle, Together With Its Admirable Diminution Lately Discovered.Magnetic declination, or magnetic variation, is the angle on the horizontal plane between magnetic north (the direction the north end of a magnetized compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole).This angle varies depending on position on the Earth's surface and.