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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 29, page id 1677894601:0039
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=39
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cherighe Lines a c and sl which couch chose circles. And
cheretore lince chere is no such Penumbra or Percurbation
in chose righe Lines there must be none in the circles.
Since che distance becwreen those Pangents or breadeh ot
che Spectrum is noc increased by che Retractions, the Dia-
meters ot che circles are nor increased chereby. Since thole
l’angenes continue eo be righe Lines, every circle irhich
in the Arst Prilm is more or less retracted, is exactly in
the Came Proportion more or lels retracted in the second.
And secing aII chele chines continue co succeed atrer the
lame manner wrhen che Rays arc axain in a third Prilm,
and apain in a Fourth retracted Sidemars, ic is cvident thac
the Rays oF one and the lame circle as co cheir degree ot
Retrangibiliey continue alirars Uniform and Flomogeneal
toone anocher, and char chole ot sereral circles do differ
in deoree oF Retransibilier, and chac in lome certain and
constane Proportion. Which is theching lWras eo prove.
Lhere is vet anocher Circumstance or cvo ot this PX- Fig. 16.
Periment br which ic becomes Aill more plain and con-
vincino. Lec che second Prism D FT be placed noc imme-
acely alter atcer che Arst, buc at Pome distance from it;
Suppole in che mid.-var betireen ic and the W’all on which
the oblons Spectrum PT is cast, (0 chac che Lighe From
the first Prism may Fall uxon ic in che form ot an oblono
Spectrum, 21 Parallel co chis second Prism, and be retracted
Sidewars co torm che oblons spectrum pt upon che WV alI.
And ron will find as betore, chac chis Spectrum pt is in-
clined cochat Spectrum P P, irhich che Frst Prilm FOrIMS
alone rithoue che second; the ble ends P and p being fur-
cher distane from one anocher chan ehe red ones T andt,
and by consequence chac che Rars wrhich 90 to che blen
end oF chelmage 27 ana irhich cheretore sufter che grearest
Retraction in che first Prilm, are again in che second Prilm
more retracted chan che rect.
The