Miscellanea Curiosa, Vol. 1: Containing a collection of some of the principal phaenomena in nature, accounted for by the greatest philosophers of this age
History
Miscellanea Curiosa, Vol. 1: Containing a collection of some of the principal phaenomena in nature, accounted for by the greatest philosophers of this age
Natural history; Science -- Early works to 1800; Voyages and travels -- Early works to 1800
Sixthly, That to the Eastward of the _Molucca's_ and _Van Diemens_ Land
in South Latitude there arises another Easterly Variation, which seems
not so great as the former, nor of so large Extent; for that at the
Island _Rotterdam_ it is sensibly less than upon the East Coast of _New
Guinea_; and, at the rate it decreases, it may well be suppos'd, that
about 20 Degrees farther East, or 225 Degrees East Longitude from
_London_, in the Latitude of 20 Degrees South, a Westerly Variation
begins.
Seventhly, That the Variations observ'd by the Honourable Sir _John
Norborough_ at _Baldivia_, and at the West Entrance of the _Straights_
of _Magellan_ do plainly shew, that That East Variation, noted in our
third Remark, is decreasing apace; and that it cannot reasonably extend
many Degrees into the South Sea from the Coast of _Peru_ and _Chili_,
leaving room for a small Westerly Variation, in that Tract of the
unknown World that lies in the mid-way between _Chili_ and
_New-Zealand_, and between _Hounds-Island_ and _Peru_.
Eighthly, That in Sailing North-West from St. _Helena_ by _Ascension_,
as far as the Equator, the Variation continues very small East, and as
it were constantly the same: So that in this part of the World the
Course, wherein there is no Variation, is evidently no Meridian, but
rather North-West.
Ninthly, That the Entrance of _Hudson's Straights_, and the Mouth of the
River of _Plate_, being nearly under the same Meridian, at the one place
the Needle varies 29½ Degrees to the _West_; at the other 20½
Degrees to the _East_. This plainly demonstrates the impossibility of
reconciling these Variations by the Theory of _Bond_; _which is by two
Magnetical Poles and an Axis, inclin'd to the Axis of the Earth_; from
whence it would follow, That _under the same Meridian the Variation
should be in all places the same way_.
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