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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 806933011:0694
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C A, C B: Thacis, inthe Rario oFche Retraction  principallr proved trom Refractions, by wtrich chele
Siven.
distinct Species are separared one trom anocher; f0
BY cc Construction also, che Angle of Inci. Blue or Purple Lishic is For Inttance more retracte
dence R BF, hach iis correspondins Retracted in passins chroush a Diaphanous Body; chan Ye)
Ansle R A F: Wheretore sincetheir Moments are loir or Red. (Scc the Words Lisht and Colour
in che Racio propoled, thole are che Ansles Coushe Where Phave siven vou a larse ACCONNE OF MF
Ot required:
e
Nemtons Experimenes, as menrioned in his Lerter
Non Etieretore mulrixlrins he Reracted Angle inche Phil. Trans. N. 80. Cc.)
by che Number of tiefserions auginented by Vni-
er, and trom ehe Produe Subcractins the Ansle of
Ic beins cheretore certain chac all kind or degrees
Ot blue Lishit, arc a lictle more retracted chan an
Incidence, roi will have hials che distance oF che reddim Liglic whatloevor, Tis plain, laitk MII
tris From iic Sun, it chenumber of ReAexionsivere FTolley. thac tromthis disterence the Breadch ot the
eren; bur il chey vere odd, from che opposite
Point oF the Sun, as Was said betore.
Tris must arile; but wrhich, is hardly eo be deter:
minedby Obserration, by reaton of. the uncertair
And From hence, by a very easie, Bore, and ele Limits oF the Colours inthe Clouds. Bur the prea
sane Construction, he ses hor ro exhibic r0 rer che Rario ot Inequalier between C A and C D
che Fye, the Incidencos of aIl manner of Triss, as or the orearer the Ketraction is, by (0 much che
eher vill appeae in any Liquor wtose Retraction frearer will che Distance be oE ans tris trom che
iS given. FOr, if etie Line AC in che last Figure, Sun; (0 thar those which are more remore FrOm
be bissected in F, have a Third pare cur of trom ehie Sun, are alvars more adorned wich a Purple
it in c, a Pourrh parr in B, 2 Fisch pare in n, 696.
Colour, buE the more near ones with a Red one
And etien there be Semicircles described on the as is apparene in che Primary tris, which ranistres
Diamerers AH, A e, AE, An, _C. alI Which MaH Or dilappears in Opposito Solis, it che sine oE Tnei-
De cur by ehe Oircular Ark DBB, and v, described
on e Centre C twich the Radius C D, (Wrtict
Radius CD is ro A C in the Racio oF the siren RC.
Fraction) in the Points B b, B~, _C. Y (aY, the
Lines AB,, Ab; AB, A v. Mall make wich the Linc
dence to chac of thé retracted Anele bC aS C ALG
CF: : Or a5 2. 20r. And it che Ratio bc grearer
chan chis, the Primary Iris Will noc be at all visible,
or noPrimaey Iris ac all can be scen.
Ir is to be obserred allo, Thac rhe Secondary Tris
A C, Ansles equal ro thie retracted Angles, and Will 30 oR in a Point, in Opposito Solis, Wvhenerer
vich che ladii C B, C B, C B, C v, respectirely
Angles equal cothole ot Incidence required; thac is
AB C (Or rather is Complement ro a Semicirele)
For the Primary Tris AB C For che Sccondari one
AB C. For the Third, anid A ~ C For che Fourrh, (5c
and (o on a5 tar as vou pleale.
FC Mes also, Thatthe Reader it still d in AI-
sebra, mar casily find these Angles by Accurare
Calculation, derired From che Pame Fountain:
Thus, Let the Radius be = r. and rhe Ratio ot
Retraction, asr 20s; ihen will chc sine ot Inci
dence be  = = = bur che Sine oF the RC
Eractec, Anele vill BC V
nhich Aneles che Primay lris will be Coundl.
For che Seconed tris V 3
Sine oF Incidence; and 4
5 Wwill bc l
be che sine or che retracted Angle. And (o on, as He
Further CheWs.
And il rou procced to Calculare accordine, 10
D. Carres his Proportion, the Primarr Tris will be
Dictane ab Opposito Solis, 47 30, che Secondary
Onc Sro 55. But che Third and Fourrh will bc
distant 40 20, and 45 33 From thesunhimsett:
Dur probably no onc can erer sec cither ot these
For the realons abore siven.
AS EO che Colours wich wtich chis wondertul
Bour is adorned, he oblerres, Thac our most Sa-
Bacious BIr. Nemton as the hrst Wvhio Meved by
most plain Fxperimenes, chac che Rays oF Listre do
nor come uniform, and simple out ofche Luminous
Body; buc chacche purewhire Lighe irhich ve
sec, is compounded ofthe C’orpusclos oF all manner
of Colours, blended one vith another, by the most
rapid Morion; and, Thac the ColourS oF aII BO.
dies arise trom their disserent Dispostions to retract
 rettect tome peculiae drecieo ot Lighc. Ilio 1s
the Rario oF Retraction is 25 T. 1O L un
Or 25 X 100. 847487. And trom thence will rum
back romards che sun himselt, and chere dis
appeas, il he atorelaid Rario bC 25 3TOL, OF 25
CAtOC C
Found in all knovn Fluids, exCepE AIF) the greateN
the Rario oF Retraction, the turcher is the lris di-
Aane ab Opposito Solis, or rather From the Sun hiiss
TCIF. che Ark beinq numbred berond che Semirirele
20 C n, ihe lris will ranith into the Sum MIIICH;
ics resrels co rhe Sur, as chey vere riehr or direct ac
cheir Rorels.
And Tromihehceit is chac che Primary and Fourch
Tris in Nacry Clouds, obverrs a reddism Colour to-
vards che sun; buc che secondarr and Third. 
Purple onc.
IAHCK ThIS, MIr. Falley Biers hou, tavire che
Distance OFehie Eris From the Sun, ro sird chie R2
rid oErhe Retraction; and etiis by a very eatie, but
not recgnie nse uen
i scom
vil
BHE IN FhC LRFCTHICCTALE LLOPOTHOHS, (WHICR arC
and cheretore the Lolours ill appear to be touna
in an order diverle Fromehac in ehe Primats MMs
untels rou lius reckon the distance ot the Secon-
dars one trom che sun himsett, which muse allo be
caken norice ot inthe ocher Tris
The Third tris in Oppossto Solis, is quite contu-
Sed; che Ratio oF the Retraction beins aS L W
91855, and from ehence it runs back in che Rario
Ot 11068250, trom ivhence again, the MaeF Ot
che Couurs beins reltored, in ihe Rario oF 4 10L.
Ox Ot C A +O C e, ic ends in Opposiro Solis.
But che Fourch Tris BeximIs trom che sun in
che Ratio oF Rqualier, passes of in the Loms op.
Posire e0 him in che Ratio OF r 10 94895, anc
thence returns corhe sun aģain, if che Ratio bC 2
10 4, and trom chence is aga in dispersed or scar-
rered colatus the Pares opposite to chie Sun, in hE
Racio ot r 1056337, wictim which Boundsare che
ReFraCCIII et all Hnomn Fluids contained.
LaIEIV, TF The RarIO Wvere aS GEO L, OF aS C R
and the L BIOMs lo appearance will De inverced, ac