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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 39, page id 1677894601:0211
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=211
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D
nels extribitins blue oF the second Order, and the sum
Will be 132, irhich is the thickness extibitins the
purple of the third Order.
To explain, in the next place, the Circumstances ot
the 2d and zd Obserrations; that is, ho theRings ot
the ColOurs may (by turming the Prisins about cheir
COmOn AXis the contrae mar to that expresed in
those Obterrations) De conrerted into wrhite and black
Rines, and aftermards into Rings oF Colours again, the
Colours oF each Ring lying non in an inverted order; it
must be remembred, that those Rinos oF Colours are di-
lated by the obliguation ot the cars to the Air whict
intercedes the Gilases, and that accordins to the Table
inthe ith Obserration, their dilatation or increase ot
their Diameter is most manifest and specdr wten they
are obliquest. No the rars oF velloir DeInG MOTE rC
Fracted by the first superticies oF the said Air than thole
oFred, are therebr made more oblique to the second su-
perticies, at irhrichi they are reflected to produce the co-
loured Rings, and consequenelr ehe relloir Circle in cach
Rinsrill Be more dilated than the red; and the excess oF
its dilatation will be somuch the greater, by hou much
thegreater is the obliguier of the rars, until at last it De-
comeotequal extent mith the red ot the same Ring. And
For the lame reason the oreen, blue and violet, will be also
(o much dilated by the Aill greater obliquier ot their
rayS, 45 to become aII verr nearly oF equal extent rittr
the red that is, equallr distant From ehe center of the
RingS. And then dIl the Colours of the lame Rino
must De coincident, and br their mixture extribit à
irtice Ring. And these wrhite Rings must hare black
arid dark Rines vetireeh etiem, because they do not
Epreact