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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
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In. Philos. Frans. LV. 1G3, Lapc. ) AGS1
lorvine Hypochesis, acconnens For chis ariat
and solvins all iis Phenomena s, trich is chus.
Fereckors the external ParS oF the Globe 2S
the Shell, and the Incernal ad a Nuclens, Or initier
Globe included ichin ours, wvichi a Auid Medium
betveen, wrhich tavins che lame common Cente
and Aris oE Diurnal Rorarions max curn about
virh oue Farch each 24. FTours; onl ehis outer
Sphere havins is curbinarins Morion, some Mmali
marrer cicher Cvister or Porver than che inTerHA
Ball. And a very minure difterence in lensch ot
rime by mans repetirions, becomes sensible; che
Incerrial Pares will by degrees recede trom che LX
ternal 3 and, not kcexins pace wich. one anocher,
Will appear oradualle co more, cicher Pastwardo
Westuard, By eie difference ot their MOrionS.
Ptow supposins such an internal Sphete havine
Such a Morion, che evo great Dissiculties in the
Former FIrpochesis, is casitr solved: For it this ex
teriox Stell oP Farth be a Magner, having ils Poies
ac a distance From che Poles oF Diurnal Roration.
and il the internal Nucleus be libevise a Masnet.
travins its Poles in trro ortet places distane also
trom che AXis; and chese latrer, by a gractual anc
Po Morion chanse their Place in respect of che
External: Wemay chen sire a reasonable accour
of the four Magnetical Poles aforemention d, 25
lilerrise ot tho Changes ot che Necdles Varia
Eions.
Lhe, Leriod, oEchis, Mocm Deins mondertu
sreat, and cherebeins hardly an hundred rear
since thele Variarions have been duly obterred, 1
will berery hard eo brirs chis Hyporhesis 10 2 C al
culus, especiallr since, tho ehe Variarions do in-
creale and decreale regularty in che Pame Place
Vec in differins Places, at no grear distance, there
are tound such casval Changes chereot, a5 can nO
vars be accounced for by a regular Hypochelis, 2
dependins upon the unequal ana irregular di ribu
cion ofrhe Magnerical Macrer wirhin che Substane.
of ihe exterrial Shell or Coac oF ihe Parch, Whict
desect che Necole trom che Posirion ic would ac.
quire trom che efsect oE che general. Magneritm o
Ehre Wvhole.
Particularty in chat rast Mer det Zur, Wohich oc
capies (o siene a pare ot ihe Wohose Surtace of. pe
EarFH.
CHEFHCH LEHO OF tHe Poles De Fix d, and Ewc
Moreable, ic remains to ascerraiti, which chey at
thac keep cheir Place. And ic evere 10 be wistic
ve had che Experience oE anocher Cencury oh
Vears 10 found out Concusions upon: Vex He
chinkes ic max be lately determind, Thac OUF Lu
ropean North Pole (Which is suppoled ro be near che
Meridian ot che Lands. find ot fingland, and aboui
7 De. Theretrom) is That chac is Moreable ofche
ivo Norchern POles, and ThaL chachas chieAv in
Euencedche Vatiarions in chese Parts ofthe W orid:
For in Fudson s. Bay, Wwhichis under the Directior
OF the American Pole, the Chanse is noc observed
to benear (0 falt, 25 in chiele Parrs, oF Furopo, 1h0
chac Pole be much fariher remored trom chie
ArIS.
AS c0 the South Poles, he rakes che Asian Pole
erhich he places abour che Meridian of ihe IMand
Celebes ro Derhe Fix d, and consequeney che Ame
rican Pole ro More, From the lilce Obserration ot
che NoW decrease ol the Variarion on che Coact ot
Fava, and near che Meridian OF che Aan Pole ; tho
he omns ro have no accoune ot the LiHects oF che
orter berond MasellanS StraisHEs.
This beins eranced, ris plain, Thac che Fix d
Voles, are che Poles oF ihis externa l ChellOF COrreK
otthe Farch; and che ocher rvo, the Poles ot che
Magnerical Nucleus, included and moreable wichin
ehe orher. Ic likcerise follons, chac chis Mocionis
Westirards; avd, by consequence, Thac cheatore
Caid Nucleus has not precisely attain d che lame de
eree oF Velocier wich che exterior Parrs in cheir
diurnial Rerolurion; buc (o verr nearly, equals it
chac in 365 Rerolres, che diterence is, (carce ser
SiblC.
This is supposed to avise siom ihe impulle
Wvhereby chis diurnal Mocion as imprels d on the
Farth, beins siren co che external Parrs, and from
chence, in time, commuicaced co che Incernal; bur
nor (0, a5 pertectly r0 equal che Velocirr of, the
Arst Mocion impressd on, and Aill conserred bs
che Supersicial pares of che ClObe.
As coche Ouamitr oF chis Morion, it is impossi
ble ro desine ic, boch trom che nature oF chis kinc
ot Obserration, Wrtich cannor be verr accurarely
performd; 25 2l0, From che lmall Fime chele Va
riations hare been obserred, and cheir Chanse dil-
corerd. Ic appears by all Circumttances, Thacits
Period is oFmany Centuries oF PearS, and aS FaF aS
may be collected trom the chanse ot che Place
erhiere chere was no Variacion by reason of thc
rgnilibrium ot the evo Souchern Magnetical loles
viz. From Cape d’Agulhas, 10 the Meridian oF SF.
TTelena, (Wvhich is about 23 de8. in abouc90 Y ears)
and ot che place where che Westerir Variarion is
in ies prearest Derection, beins about tale somuch
viz. From cheiDe oF Dieso Roiz, 1o che Southest
ParIS OE Madasascar; Wve may wirh some realon
conjecture, Thâc che American Pole has moved
WVestvara 46 degr. in hac Fime, and thacoche
Whole Period chereot is pertorm d in 700 Y Cars, Or
chereabours: S0 char, che nice determination oF
this, ard of several ocher Parriculars in the Mag-
nerick Syctem, is reserred for Pocterier; abl chat
e can hove to do, is to learebehind us Obserra-
tions phac may be consided in, and co provose HV
pocheses etich alter Ases max Examine, Amend.
ulent
Otrhis, the Variarions ac London ade Laris BI
a notabse MMcanice; 1Ot MLecur Has Me COI
Atanely abour L: more Fasteriy ac Paris than ac
London: Lho ie be cecan ual accorns loe
General PRect, che difference ouxhero bethe con-
trary as hotwichstandins We ue. ralla
tiens in bol Places do chanse alike.
Flence, and From lome ocher chinss ot litce nature
it seems plans, etiar che ervo Poles of che externat
Clobe are lix d in che Farch, and thac if cheNccale
ivere ertrolls sorerned by chem, che Variations
thereot rould be alvars the same, wich (ome sI.
regularicies upon the acconne bur just LOW MMI
riorid. Buc the incernal Sphere havins such a gra-
dual Franslation oF ils Poles, does intluence che
Nccdle, and direct it rariousY, accordins to che
resule ot che accractire on directtire Pover ot cach
Poles and consequeney, chere must be a Period ot
the Rerolution oE chis internal BaII; atrer whieh,
the Variarions ill recurn again, 25 before. BuF
il ic Mall in future Ages be obserred ocherosile,
e must then conclude, chrar there are more 0t
chese internal Spheres, and more maenecieat Les
than Four, vtrich, cac prelenr, ve hare  au
e non vrial cuautiet aes aeeirtite dus