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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 806933011:0345
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Theretore in che common Parabola y: Z:
:=: 5Z: y; that is, IHC Fluxions oF the Ordi
naces are reciprocallr a5 che Ordinates.
Theresore it an FEyperboloid be Form d Froin che
Parabola; that is, one wwhole Ordinates (10 che
conrex side oF the Curre, ard Parallel 1o one of
the A(ympEOteS) be 2 Series oF Reciprocals tO thc
Sublecundans; and one Asymprore Being the AXC
oF the Parabola, arid che orher the Verrical Pangen
oFche Parabola; then the Fluxions oF che Parabo
lical Ordinares Mall be as che correspondins Ordi
nates in che LErperboloid.
In che Vulear Crcloid, che correspondins Cir
cular Ordinares beins called s, andt, trom the Ma
ture oFthe Crcloid; = s-= C, andZ = 1 -1 - C, the
Onantiries c and C expressing che Circular Arches
But Som Mhe Nature oC che Circle s. ] c
Erx = X  and c + C - 2 r v =
that y : Z: : 2r
Er, = DX 5. So chac the FluxionS oF ihe Cy.
cloidick Ordinares, are in the Racio compounded
oF the Segments oF che Diamerer directlY, and the
Circular Ordinares Inversely, or a5 che Rectansle
under chose dexmenes, aud che Ordinares alter-
nately caken.
Inche Circle purrime e, C, ihe Fluxioris ot che
Curre correspondins ro the equal Fluxions oF che
Abscilles in and i, ve have i = , and C-
and conseguenels, c: C : :  : = : : 2: y; cat
is, che Fluxions oC che Curre are reciprocalls 25
che Ordinates.
FLDXDS Clylosus, ehe same wich Caliaea
passio
FLDXOS Hypaticus, is a tind oF Dysentery
Wherein black Chining Blood, and much Orer. HeaE.
ed and corritied, a5 ic vere, is driven our of the
Gurs by the Fundament: It is Pomerimes caken
For a Dysencerr, Wrherein serous Marp Blvod is era
cuated. Blanchara
FLY. Sec Flie.
FL VINO-CAME, is a Cnall Body OE an AEmy
consistins oF 4, 5, or 6000 Men, and Pomerimes
OF a greater Number, 25 WveIl Foot as FTorle, which
continualls keepsche Field, makins divers Mori
Ons, to prerene che Incursions ot ihe Fnemies, Or
rotrustrate their Enterpriles, to hinder Conrors.
EO harra(S Ehe adjaCenE ConntrY, and eo chrOW ii
selE as occation serres, into any Behescd Place
FLTINOPIHION, is a part oF 2 Clock ha-
vins 2 Fly or Fan, cherebr to sather Air, and lOto
bridle che rapidirr oF the ClockS Morion, Wwhen
the WVeishe descends in the Ariking ParE.
FOCTTE Majus, isthe greacer Bone oF the Cu-
bit called vina; or che Prearer Bone oE rhe L C5,
called Fibia
FOCITF Minus, is the lesser Bone OF the Cu-
bic, called Radius; or phe lester Bone oC ihe L es,
Calied Fibula.
FOCVS, is vich Tome, a place in theMelencery.
Or orter Pars, utience ches Formerly deduced ilic
Orisinal oC L’eavers.
FOCVSOF an Cllipsis, is a Poine corrards cacti
end ot the longer Aris; trom Whence rro Rig
Lines beins drann ro any Poine in the Circumte.
rence, Mal be rogether equal ro char lonser AXIS.
Sec ipsis
FOCOS OE a Parabola, is a Point in the Aris
wichiin che Fisure, and distant trom che Verrex by
a tourch parr ol che Parameter Or Latus Rectum
20 Sind iE, Sec Parabola, Consectary 5.
It is called che Focus, because ic is che Poinr
wrhere the SunsRays Wwill be unired, wbhen reflect
ed trom a Parabolicke Concave, and consegue
will chere burn Bodies; and hence by lome ir id
called, the Burnins point. Sec more under P atd
bola.
EDCDS (in Opticls) or phe Foeusot a GIaS
is the Point of Convergence or Concourse, where
he Rays meec and crolo che Atis, atcer pheir Re
fraction by che ClalS.
FTou co sind this PoinE Or FOcCUS, ME. MolyneuX
in his Fxcellent Dioptrica Nova, eires severa
aemonstrative WayS, P48. 10, 11, 12, C9C.
P. HE chere be a Body of Cla(s, Wrhole Surtace is
Convex, or the Segment ot a Sphere, the Focus
Wvil be distant From the Poleor Verten ot he Cla(S;
almost a Diamerer and hal( oF he Conrexies.
2. In a Plano-Convex ClaS, the Parallet R ayS
are unired wich che Aris, or ies Locus is from the
Pole oF the Cla(S, ac the Distance oF a DiamCTCK
oE che Conrexiry, il che Sexmenc be bur of 3oDC.
Sices.
In a Plano- Conven Gla(S, 25 707 : 193: : 50
is che Radius of che Conrexier co che Retracted
Raytaken in ies Concourse wirh phe Aris; Which
in Classes ot large Spheres, is almost equal eo rhe
Distance ot phe Locus raten in che Anis.
3. In double Conrex Glalses ot the lame Sphere
the Foeus is distanetrom the Pole oF the Cila (S abour
rhe Radius oF the Conreniey, iF che Segment be
buE 30 DCorces.
Bue iE che Conrexiries are unequal, or it the
cro dides are Desmenis ot disterent ophereo;
Thenche Rule is:
AS the Sum oF ihe Radii oF borh Conrexiries,
Porhe Radius of cither Convexier alone::
Sois the double Radius ofthe orher Conrexicy,
TocheDittance oF rhe FOCuS.
any Ctalo, dre noc united wirh ie (0 Toon 25
those Wleh are Farther of: Nor will che EO.
cal Diltanco bc (0 great in a Plano Convez
GlalS, When the Conrex side is rowards the
Obiect, a5 on the COnFraEY. WherelOre chaL
Learsed Geneleman concludes cruly; That ir
vienins ans Obicet by Plano. C
the Conrex side Mouse be turned ourvard:
AS also in Bumins by Tuch a GlalS; Pa5. 25.
FOCOSVirtual. SeoVirtuat Focus.
Air Parallel coche Axis, che Virtual Focus, by el
Ars Retraction, is aerhe Distance oF a Diamerer
aud a hals oE che Concariry.
N. D. The Rars irtich FaII ReATEF IHC AHS OF
1. LI. Concare-tastes, Weh d Ray talls FTOn