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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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Coloux is one and the lame, Whertier ic be WMce, quenly all che rarieey of Colours depend uxon the
Composicion oE Lishe.
Prop. TII. Problem.
Lo detine che Retransibiliry oF che leveral POrrs
ot Hlomogeneal Lishr ansverins rothe sere-
ral Colours.
In ehis ihe Auchor is very curious and exact,
Mevino che LaWS OF the Retractions ouF OE GlalS
inco Air, Whence by the 3 AXioms oF his ArA BCOK
che Lars of Retraction our ot dir into Clals are
easiy derired. And finding by Eixperimene, char
erhen Lighr zoes out of dir chro leveral contipuous
retractins Mediums las chrouxh Wacer and Ca (5)
and thence poes out again into Air, Wwhecher che
Rehracting Surtaces be parallel or inclined coone
another; Thac LigHE, a5 OTren aS by CONTPArY Re
tractions tis lo corrected, as that it emergert in
nels of che emersins Lishe, will by degrees, in
passins on trom rhe place ot Lmergence, become
can eacher rwo Theorems (which he chere sives
and by Which che Retractions ot che Rars ot eve.
Ey COrE, made OuE OF any Medium inEO RIr, are
tinoun by havine ehic Retraction ot che Rays OE
one Corr; and allo rhe Retraction out ot one
Medium into anocher, may be trad as often a5 yov
Again, a Lens beine placed abour 8 Feet from che chird Medium. And chele Theorems, it admit.
red into Optickes, Would sire a scope ro rrear rhar
Subjeet voluminousy atEer a neW ManNeE, nOK
chearically ail kinds ot Phaenomena ot Colours
pohich could be reduced by Retraction.
Prop. IV
Colours may be produced by Composirion whict
MalI be like che Colours ot tlomopeneat
Lighr, as co the appearance ot Colour, bur
noc as co che immutability oF ic, and che C on
Picurion of Lighe; and chole Colours, b.
hon much more cheyare compounded, by se
much are chey lels fuil and incense, and B.
100 much Composicion they may be dilures
and weaken d, cilt chey cease. There may
also Colours be produced by Composicion
erhich are nor cullys lile any ol che Cotours ol
Hlomogeneal Listic.
Fellon, CTanee, et scu, ae in che midale ot
che Emeroins Liphe, Wherechere sho Contine o
Shado ac all, che C0 our is else tety lame a5 at
the Edges; che Whole Lighe ac ies enctance
ot one unitorm Colour, Wvhechet Wce, Lelto
Cranse, or. Red, and soins on eltence perpetually
without any chanse ot Colour, luclt as che Contin
oF Stadon is rulpariy suppoledro work in its Re.
tracted Liche ac iis limersence.
Bleicher can chele Colours dise Hom any nem
Modisicarions ot rhe Lighe by Retracts, a
cause ches chanse luccessively trom Wielo Le
de, Oranse, or Red, ivhie n slenactions re-
am che lame, and allo becaute ene Retractions
are made contrary ways by Palatel Superficies
Which deltroy one anochers Lfects.
He Mews allo in Experiment the FIrI OF This 20
policed abour 20 Feec trom che Hlole ot a aarkned sene Rays be inclined co che Incident, che Wrhire
Koom, vou may lo incercepe che Rays ac their
Antrance, as torake away ary one Coiour (which
Spectrum or caoured Image, and lenre He Me le
mainine; Which ewrs Chac all Colours tave an
Indifference ro any Contines oF Stadow, and
cheretore che Difterences ot chese one from ano-
cher donc arile trom the diffetem Contines ot
Stradow, Whereby che Lixhe is rariousy modesta
B00k, Thac by applyins an lron Wire, or such Lines parallet eo chole in whien ic as inciden
like Body, eo a prover parr ot a very larse Prilm conrinues ever after ro be Whire: Bur it the emer
vou pleale) cicher whol. y Or in part, our ot checinsed in ics Rdges vith Colours. Ile chinks he
as hach hicherro been the Opinion of Philolophers. hare che Retractions our ot chem boch into an
Prilm, ac the Hole, had a Paper placed in ils lo-
cus; Wrhich erhen ic as sicuace perpendicalar to
arten very much oblique, appeared Zellon and perfection ot Vition, bur allo by decerminine Ma
Red, Wrhen inclined onc way, and Blue wrten
rurned another; and yet here che Contines ot
Lighe and Stradon, and che Retractions oF che
Prum remained in aII Cases che same: And che
Reaton ot che Phaenomenon (he Mews) is chis:
Tharche Paper in onc Posture beine more oblique
roche more Retrangible Rays, than eo the lels, i
more Aronsly illuminared by che lacrer chan by
the former; and cheretore che less Retrangible
Rays are predominane, in the Reflected Lighe, and
ahere ever chey are so, they cinge rhe Lighe wict
Vellou or Red; 2s when the P’aper beins placee
in che concrary ay, and in an oblique Polture, the
more Retransible RayS BCCOMC PTCHOMIManE; ade
15
che Lighe appeared ot ies omn eolour Whire; bur ontr by ceachins rhose chines which rend co che
they alvays ringe the Lixhe wich Blues and Violet
6o0l0
All Flomogeneal Liphe hach ils proxer Colour
ansiverine ro ies degree ot RetrangioIs
and chac Colour cannor be clans cu vy RC.
Aexions and Retractions.
This is plain by Experimene, for alter he had
separated the several lorrs oF RayS one from ano.
ther (as he Mens hor eo do in che Eaperiments be-
thac means sor a quanciry ot Hlomogeneal Lishe; che Lole ot a darhenea Room, the Liehe in the
ehis Spor of Hlomoseneal Lighe as atrerwards un, Locus ot ehe Les Converged, and chere made;
capable ot beins changed by cither Refraction or sbriohe Spor, Wwhich Tccee N d irtire Paper
Restexion, and a il Bodies placed in thac Hlomose- chere, ale in a riste or normal Posrion co ihe
neal Lishe Aill appeared ot ies Colour, hoverer Rass, appeared Whire on che Paper; bur it ei
ditterent cheir eun proper Colours vere from chac.
drem wbence he concludes, Thac it chie Surs
Fiphe consisted bur ot one Corr ot Rays; there (to axpear Cea wich the ulual Colours OF che
avould be bur one Colour in the wholeWorid; Pritu on the reason oE its appearine Wrhire
nor vould ir be posible eo produce any ne Co-
Whicenels, and sll Crey Colours becween
Wie and Black, Ma) be componnded o
Ocher Colous; and ihe Whicenels of rhesun
lours mix d in a due proportion
This he proves by many lxverimenes, and in
Parricular, by chis; Phac à Lens being placed re
Liehe is compounded ot all che primary C0.
cher che P’aper be moved rowards the Flole or Bc.
hind ihe Focus oF the Lens, ic will presenely begir
ac the Focus, Was, becaule chere all The Rays vere
Out D. Credexions und Botcactions; ade ChilE. sexactiys mineled; t il any C0. ouc, luppolo ic
Ret