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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0589
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OE Craviey ot ic will be ie cente e e
FiOn:
are, thetruex viil the Fenautum lleasue Lu
Or che more Tsochrone will the Vibrations bC, 25
lome lorero express chemselres.
20 fina IC CCMsC et emalton canctly, in
order to adjust the Royal Pendulum of a C lock,
Mr. Husens sives this Proportion, (FTorol. O(
cillar. P. 141.)
AS the Leneth oF the Scrins from che Point
OF Suspention, r0 the Cenere oF a BaIl or BOb:
is ro the Semi diameter oF chat Ball Ox BOb :: (0
is thac Semidiametex ro a Fourrh Number.
Add Z OF thac Fourrh Numbex ro the former
Lensch, and rou have che Centre of Oscillation.
Bur this Term, the Centre os Oscillation, is
Buc supposine che Luta d ca round che
Centre A, OF E0 Lvins M I like a Pendulum,
wich ies Weighes B and D aMXC1 IC, 25 bC
Tore: In chis Cale will ihe Weishes B and
acquire cach a Degree ot VelOCUY, PrOPOTHION
able rotheir respectire Distances trom the C’en-
tre. And consequenes it o (suppole) hadbeen
cheir common C entre ot Gravies, betore The hebu
Rocarion oF the Libra TOUNd A, IE CANNOF nOW
dies B and D ill poire, ox bc in lquiliorio:
otren in Mechanicks caken in a more large and Thar is, che Poine o cannoc be che Cenrre ot
comprehensire sense. A5 suppose chere Dc 2
Libra, as BD, havins che Weishes B and D
Oscillarion.
S ry oter tioure buc ortieular, che
De the Poinr on wtrich che Rerolvine BO-
For ILC 0 15 Suppoled co be the commor
Centre et Gravier, Theretore the Momene ol
B O X B, must be equat 1O chC MOMEMC O
DO mulciplicd by D: Buc since elle reicirs
et B 151OCat Ot D, 25 AB 1l AD; chere.
fore che Compound Noment oF B X BO X AB
cannor be egual ro the Compound Moment ol
DX DOX A D; and consequene chere CaN-
nor be an Fquilibrium about the PoinE o: WVhere
N. B. LHC MMOCEE the Oscillaton  Slvine
Mallbe equual TO ThC HABHMMCOT BXDC X AD.
ien ill C be eneiu Cenere ot Oscillarion;
Fore il an Obex or Obstacle Mould meet with
the Libra in ehe Poine o, the ra Woa olci-
lare or dip row Ards the Parrs et D, OcCaMC MaL
Momentum iS the fFCaEeT OL CHC LWO. BuL THC
hangins ac is ends by their Ceneres e Gravity
B and D; and let che Poine CDC CC Lpo
mochlion, Fulciment ox Prop Which is suppoled to
Support the Libra in the Common C CMCC OF GFa-
vier C, belongins to chervo Bodies D and D.
ehien will chose Weishus be in Equilibrio. Let
ehis Libra; Wrich che Weistus B and D hangisse
at ic, descend perpendicular ro che HTorizon alto
gether, and Cil recainins a Parallelilm r0 ies
selE in ies Arst Siruation; and a5 ic thus mores.
sel ic meet ith un Obstacle, as F, irhich Mall any plain or solid Fisure to rerolre abour the
srike ic in C, the abore mentioned Coion
oF che Libra was by aparallel Morion, the P’oinES
B and D vill have acquired equal Velocitles;
and consequentr che Weishes Malsins at luch
Pomes will also gain equal Velociries; aet ilere-
tore il the Libra Arikce upon l, ie Lgunrium
must continue etie same as betore, thal Ls, Wwill
noc escillare ox lving any war, buc hecp ac Riohe
Anoles wich cheline C F: Wcteto IS BOTh
che common Centre oF Grarier, altil allo 0
Decillation.
Thro the Point C oF the Rerolvine Figures
catren in the Axis ed, ler che Line ki be deawn,
dividino che Figure into rvo Parts, eki e anc
fhi; che Ceneres ot Craries oF which Parts
suppose eo be ar b and d: Then il the Com
pound Homent OE i e, RCX b cX AB = Kfh+
X cd X A d: FOr the lame ReaIOn as WIC,
Cwil beche Cenrre ot Oscillarion
Xbir Chaaisiom M11. Ehumelity Dicon.
erue Centre oF Oscillarion Will be a Point 25 C,
cakcen (0, chac the Moment OF BX BC X AB,
Thacis, it AD. AB:: BX BC. DXDC
ale UE ihC Kerorins Libra thoula bC suppolee
le neer wich an Obex, it voula hot biestale
apon Ic.
ed icl io Neicaco, a5 abovc, We colccre
Centre A, irs Cenre oE Oscillarioh is ro be de
In litre manner, is instead oE a Libra burden-
Centre ot Crarier: Then because the Descent rermined by che lame Principle.
OSCITA