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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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Lex the Concaritr oF the Glass DC a B C, and its
IuS) and is vet lels ac remorer distances trom es
Farch: Bur ac equal distances, tis alvars che lame,
hecaule all Bodies, heary or Lishe, sreat or (maII,
absractino From che Resistence ot che Medium, arc
equally accelerared in cheir descent.
Vis Centripetae Ouantitas Motrix, is ils Meature
proporrionable to ihe Morion Which ic generates in
a siventime: Asthe Wciphris greater in a src2
ter Body, and lels in a lester; and in che lame Body
Sions. Phis Force is the Cravity or l’endener ro
Wrards che Center oE the Whole Body, and is aet
one wich ies Weishe, beins alvars dilcorerable by
Iome equal and conrrary Force hindring rhe delcenr
Aris dc: Ler f5 be a Ray os Lighe falline on the oF che ticarr BodY.
Ola(S, Parallel 10 che AXIS dc; and let d be the
Center oF the Ark a bc. This Ray f5, atter ii
trath passed che Class ac ies Fmersion ac s, Will nOt
proceed directlr co h, bur bc retracted trom che
Perpendicular d 8, and will become che Ray s k
Draw chen directiy ek, (0 a5 char ic may crols che
Axis in c. The Poinee (0 Found, NIr. Molyneux
Calls ehe Virrual Focus, Or Point os Diversence. P. 56.
Dioper. Nor.
VIS, Or Force; 25 vis C armis, By FOrCC D
ArmS. And ehis Vis is Firetold, Vis impulsiva ab
lativa, expulsiva, curbativa, and inquierativa: Vis
ablariva, is the cakins away ot moreable chinss:
Andhence accrues an Actim, Duare vi (5 armis,
_c. Vis compulsiva is, when any onc is cast out
ot his Possettion. by Lorce and Arms. Vis turba-
riva, is when ans one is dicturbed in his Posesion,
a5 when cuo Arire ro Possels che lameching. Vis
inquierativa, is when one Man will noc sutter an-
other quietly ro enjor his Rishr, or todo anr chins
in hisoun Bounds or Limits. And From all chele
lome Porr oF Action ill arile.
VIS Centrisuza, is the Force by which any Bod)
revolrins round anocher, endearours ro Ay oAtrom
che Axis of che Morion, in a TanBenE e0 chac
Curre.
TheCentritugal Force is alvars proporrionalro
the Periphery wwtich any Body describes in ies
Morion round the AXis oF ies Morion, by chC srs
TheOrem OF MIE. IIusens de vi Centrifusa.
VIS Centripeta, i5 thac by wrhich any B0d
(trom whac Cause Coerer) cends towards any Poine
aS HO IIS Center.
The Vires Centripetae, are alvays as the Squares
of the Velocicies dirided by che Radii ot che CII-
cles described round the C enter.
And also Reciprocally, a5 the Squares OF thC
Periodical Rerolurions dirided by the Radii.
Wrheretore, is che Periodical Times be equal
both che Ceneripetal Forces and Velocicies, will
beasthe Radii, (3 vice versi.
EEthe Squares ot the Times oF che Periodical
Rerolurions are as the Radii, the Centripetal FOE-
ces are equal; and che Velociries in hals rhe Rario
OF che Radii; and vice versa.
HEche Squares oF the Periodical Fimes are a5 the
Squares oF the Radii, che Centripetal Lorces are
Reciprocally a5 che Radii, and che Velociries equal,
and vice versd.
H che Squares oF the Fimes of the Periodicat
Rerolutions are as the Cubes of rhe Radii, OF Di
stances from the Center, (Wtich is the case oF al
the Planets movins round che Sun, and oF thc
MoonS, OF Secondarr Planets movins round The Pri
maxy) ihen the Centripetal Forces (Or Grariey ot
Bodies) are a5 the Squares of che R adii or Distan
ces tromthe Cenrer, (a5 we find ic ro be) and che
Velociries are in halEche Racio oF the Radii, and
vice versa. Sec Mr. Nentons Princip. Phil. Ma-
themat. P. 35,
I che Centripetal Force oF any Dody morine
round anocher, be a5 the Distance; thAE BOd)
moves in an Ellipsis, havins its Center inthe Cen-
ter of chacForce; er perhaps, in a Circle equal 10
Fhar FIIIpSIS. Idem
OF ehis kind is Gravity, by wtich Bodies tend
ASeo Which, Gallilaus hathehis Theorem, That
tomards che Centex oF che Parth: And such is che it such an Fllipsis, its Foci becomins infinitely Di-
Magnetical Force by which Tron rends cormardsche Aant, Mould chanse into a Parabola; che B0dy
Center OE the Magnet: And oF chis kind is chat vould move in the Curre ot such a Parabola
Force or Porver whaterer it be, by wrhich all che l and che Vis Centripeta respectins no a C enter in-
Planersare continually drann from a Rectilineal ( sinicelr Distant, ould gron Lquable. Fo wtict
Morion, and forced rorerolve in Curres.
The Ouantiey of this Cencripetal Force, is ot
chree kinds: Absoluta, Acceleratrix, and Motrix.
The Absolute Ouantity oF it, is its Measure, Brea
ter or lels, according cothe FfficacY oF the C’ause
chac produces ic; and wwtich exerts ic selF on aII
Bodies in che Regions round about: AS the Mag
nerical Vircue in some Magners is greacex chan in
ochers, cho oFche lame Dimensions.
Vs Cencripetae Ouantita Acceleratrix, is its Mea
sure proporrionable coche Velocier which it pro-
duces in 2 SIrel MMC. Thus cheporver ot 2
MIr: Nemron adds, That it a Parabolick Section ot
Loadstone is grearer at a le(s, and leser aF a gFC2-
a Cone, by che Inclination of iis Plane co the Side
ot che Cone, Mould be curned inro an FEyperbola
che Body ould continue romore in its Perimeter
and ies Centripetal Force, vould be chansed into L
Centrifueal one.
IF any Body Frcels se LO a CenCeF, 25
in che case ol the Planers round the Sun, ils C en
cripetal and Cenrritus al Forces must be equal
communicared ro, 2nd exerciled upon any B0d)
TeF AHILAHICE NOIH CIIC SIOHC. GTaVIEY IS GECATeE
in order to chanse irs present Scare, cicher ot Rest,
OrMocion, uniformir Fervard in a rishur Line. Newt
Princip. Mat. This Force consiltsencirelr in Action,
and atcer thar ceases, cannor remain in any Body
For cheBody continues in irs neu Stare, Whechet
in Vallers, and less on ihe Lops oF hish Moun- oE Mocion ox Rest, by che vis Tuertia OnIY.
cains, (ad is plaim trom che Fixperimenrs ot Pendu-
it is grcacer near the Farth, and lels in remore Re.
VTRTVAL FOcuS, Or Point of Diversence In
Concare Cla (S, is the Point e in che Tollonins
BUTC.
Vis impressa  an lmxulle, ebile, et action