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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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TastIy. Sec OH correspondene Langenr. Lines up.
on che Cielins, and makre like HTour-Poines, dravr
the HTour-Lines, vou necd noc bloc our che lqui
noctial Tangent, it beins pleasant ro sec hou The
Sun Will g0 in chac L inc all Day, When ic is in rHC
Equinoctial. Besides, the Equinoctial. Point vil
cellrou on char Day Whecher joux Glass lic Flori
roncally, wtich is lome hac disticule ochervile 10
determine. Or uxon any Day rou may Calculare
the Surs Meridian Alrirude, and sec Whecher is
Falls just apon char Point in che Meridian ac 123
Clock
This Dyalis nochine bur an Florizontal Inverr
ed, the Centre irhereot is in che dir Wwithout, ex
cexe rou make a Norch Dral, and chen ic ill bc
uxon the Cielinz, wtrich ron must And by ies di-
Rance trom che Eguinoctial. Point, and let thar
CenErC GOVeEN VOuF Tangents. The ground ot chis
Dyalis, char che angles os Restection are equal to
the ancles of Incidence
Somerimes, instead ot rvo Tangents, vou maz
use ruo Circles, especially when the Centre ot che
Dral is upon che Cielins, or when jour Clals is
near che Window-Cielins, chen the Equinoctial
Poine will be upon thac Cielins, and vou may pro-
ject che HIourLines upon che Chamber Cietins
Or the WVails, by one Thred exrended over che
FTOur.Lines, and another Thred rouchine thar, anc
extended trom the Equinoctia l- Point, or any Poine
in cheimaginaey Axis ro che Cielins or Wall.
REELECTINIC Telescope. Sec Felescope
RFFLEXION oFthe Moon, is (accordine r
Bullialdus) her 3d inequalier oF Morion: This Tycho
calls by che name oF her Variarion, Which sec.
REELOX os the Sea, is the Ebbing oF the Wa
ter ost From che Store, as its comine on upon it
Or Tide of Flood, is called the Plux ot che Sea. Sec
Tide.
REFRACTED Anele, in OptickS, is the Angle
contained betmen the retracted Ray and che Per
Dendicular.
REERACTED Dyals, may be made thus; SricK
up a Pin, or altisn any Point in any Concare BoWI
and make char che Centre of the Llorizoncal Dy 21.
astignins the Meridian. L inc on che edges ot the
Bowl, andtakino away che FTorizontal Dyal, ele-
vare a String or Thred from che end ot the said
Pinfatned cherero over the Meridian Line, equal
co the Fleration oF the Pole. or Lacitude oF che
Place; then wich a Candle, or it vou brins che
Thred ro rhe Shade upon any FTour-Point formerty
maxked out on the edzes of the BoWI, at the lame
rime che Stade in the Bowl is the HOur
Line.
And if the BOI Be FuIl OF WVater, or any ocher
Liquor, vou may deaw the FTour Lines, Which
vill never Mew che erue ITour, untels Ailled wirt
the Caid Liquor again.
RFFRACTION, in general, is che Incurratior
Or chanse ot Derermination in che Body mored
wtrich happens to ic, Whil iE enFeFS OF PenerratCS
any Medium.
Liehe from that righe Line which it vould have
Passed on in, trad noc the densier ot the Mecium
turned ic antue.
MIE. Nemton Found chac che RayS oF Liste are
Incurvated ox Retracted in cheir Morion wtieneres
ther come near the cdpes ol anr Bodr, cho ic be
noc Diaphanous. Sec Lighr
And he thinks Chat thC FrrOYS OF Retraction in
Oprick Glasses mighe be corrected it rvo Spherica
Classes vere combined togerher with WVarer in
cluded betweenthem. And such Colastes he judge
preterrable ro Elliprical or Eyperbolical ones
because (besides char cher con be more casilu
Ground) cher do more accurarely retract che Pen
cils oF Rays posrred withour the Axis ot che
OtalS.
Dr. WVallis in Philos. Frans. NV. 187, Taich, Thar
tho Retraction by Vapours near the Loriron, ma
makre a chins appear Bigher, yer ic cannor make ir
appear broader; Wwhereas in Retraction by Clas
ses, the chino is appareney entarged cvery
Wwar.
Retraction in Fluids arises, is noc calie to deter.
mine, cho ic vould be ot grear Adrancage is in
could be discorered: Pure clear Warer, ot allFlu
ds, retracts rhe Rays oF Lighe che least; and il
ic be impregnared ich Sales, ic encreales che RC.
Fraction in proporrion roche Ouanciry and Weiphe
OF the Sales dissolved in ir.
The Aquae Styciae, Or Corrosire Menstruums
Tuch a5 Aqua Fortis, Xc. Which are Sale dissolvea
and rendred Corrolire bsese riolence ot chetire
do vet MC More HCACCME SM LaS WC
pentine, wtich is lo lighe and fine a Fluid, a510
be generally called, an Ptherial Oil; Why chele,
Far, Mould Produce lo ereat d cestee ot Retracti
On, a5 ris hnomn cher do, is a chins oF ereat disr
culty ro accoune For, and Wvell delerres a Farthet
Fnesitter io.
Fore he will appear Oral. And tor ele Laie tea
From whence ic is, thac the diverse Porver of
necd nol De ondred ac, Decause thele arc muct
denser and heavier Fluids chan che FoMHIeL. BuF
xhen votr in such lighE FnC LTUIUS dS SPITI ot
Nine and ocher Ardent Spiries; in Oil OF TUF
Dr. Grecory inhis Astronomr, very vell acccuns
For the ral Figures which che Sun near che HIOri-
zan (especiallr in high Laricudes) is Pomerimes
Peen co pur on trom Retraction. For havins be-
Fore demonitrared, lhar because of the F arrtiS AF-
mosphere all Bodies near the Hlorizon, will appCat
Comechins hixhet in the Vertical Circle Tan isey
really are, and chis the more, the nearer they are
tothe Horizon: Ile Mews chac che upper Marsit
Of enC Suus Diste beins raised a licele more chan ir
oughero be, alu ne lovet e a sleat ane,
he Suns rerticat Diamerer ill Seem eo be con-
eracted, bur the Florizontal one will nor, and chere.
In Biopichs, il ls the variarion ot a Ray ot
DF. Fsook discorered by Experimene, Thac che
Sines oF the Angles ot Incidence ot che Rays oF
TOn, IC OTerred DICAnCC OF EVO FIX d STAES, IS
Tensibly sels (Wwhen mealured by an Instrumenr) it
thes are in the same Verrical Circle, altet oe O
them near e Hlorizon, chan when etes bochhare
a considerable Alriude.
Afrer this he Mewshow coderermine rhe duan-
ciry of che Retraction in any siven degree ot AIi
tude, and co makre a T able oFiC; THuS.
Let lame Fix d Scac haring no sensible Parallax,
and much elerated abore the Hloriron be cholen.
Wrhole Place he Mes hou ro derermine at P. 164
Prop. 26, by Obserrations made when che Scar is
(0 high as ro hare no sensible Retraction. Ther
let the Time be noced when ihiis Scar hach any
knovn Alticude, (a5 raken by an Instrumene) and
Calcularion made For therrue Alcicude, (accordine
co che scars hnown Place) che Excels ot the ob-
Secthe Pretace to Micrographia, Where his Instru.
mencis described, by whict he made ic Dileo
serred Asciucle abore bis ie che Reteaction.
Licheare proporrionable rothe sines oF Retraction.