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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 142, page id 1677894601:0162
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=162
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1
reduced into Paralleliim and diverse nO MOrC. FOr
chenthole rars rill recompole a Beam ot irhice Light
XV. IF the refractins Anele ot cither Prisin De the
bigoer, that Prilm must be lo much the nearer to the
LenS. Tou Wil knom irhen the Prisins and the L enS
are Well set together by oblerrins it the Beam ot Light
Z Pirhrich comes out of the second Prism De pertectiy
erhite tothe verr edges oF the Light, and at aII distan
ces trom the Prilm continue perfectlu and totallr mhite
like a Beam of the SunsLient. For till this happens,
the position of the Prisims and Lens to onc anothei nust
De corrected, and then if by the help ot a lons Beam ot
Nood, as is reprelented in the Figure, or by a Tube,
Or lome other tuch instrument made For that purpole,
ther be made Fast in that situation, you may tey aIl the
lame Lxperiments in this compounded Beam oF Light
XV, irtich in the Foresoins Lixperiments hrare been
imade in the Suns direet Lisht. Lior thus compounded
Beam oF L iohEhasthe Pamme appearance, and is endoved
rith aIl the same Properties rith a direet Beam OF the
SunsLiohe, PoFaras my Obserration reaches. And in
errins Experiments in this Beam you may by Roppins
any OEthC COlOUES P, 9, r, Sand L, at the lens, sec hon
the Colours produced in the Lixperiments are no ether
chan those rrhich ehe rars had at the P ens before thev
entered the compolition ot this Beam: And by conte.
quence chat they arise not From any neur moditications
OEthe Lighe by retractions and reflexions, but Fromthe
various leparations and mixtures ot the cays originally
endored rith their colour-makins qualities.
S0, For instance, havine with a Lens 4 Inches broad,
and to Prilms on cicher Hland 6 Feet distant From the
P. enS, made such a Beam ot compounded Light: to
eXaIIM