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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 102, page id 1677894601:0278
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=278
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C10
them (viz. Writh 113, 23, 22 and 33 Tnches, and there.
Fore the Theory ot deriring these Rines From thethick-
ness oFthe plate oF Glals of ertrich the Speculum Was
made, and from the obliguier of the emersins cars agrees
rith the Obserration. In this computation I have
equalled the Diameters ot the briont Rinos made by
Lieht ot aIl Colours, to the Diameters ot the Rinos
made by the brighe vellor. For this vellor makes the
briohtest part oF the Rines oF aII ColOuES. IF rou deBre
the Diameters oF the Rings made by the Light oF any
other unmixed Colour, rou may find them readily by
puttins them to the Diameters of the bright vellonr ones
in a subduplicate proportion ot the interrals of the Ats
otthe rays oF those Colours wrten equally inclined to
the retractins or reflectine surtace ertrich caused thole
Fts, that is, by putting the Diameters oF the Rings made
by the rays in the extremities and limits of the seren
Colours, red orange, vellor, green, blue, indico, violet
proportional the Cube-roots oF the numbers, 1, 8, 3,3
353 163 2 Wrhich express the lenotho oF a Monochard
Toundins the notes in an Fioht: For by chis means the
Diameter ot the Rinos ot these Colours will be Found
preter neaxty in the same proportion to one another.
Wrhichther oughe to have by the Aitth oF thele Obser-
rations.
And EuS I Catistied my selF that these RingS vere OF
the same kind and original rith thole ot thin plates,
and by consequence that the tts or alternate disposi
tions oF the rays to be reflected and transmitted axe PTO
Pasated to great distances trom every reflectins and re-
Fractins Curtace. But vet to put the matter out of doube
l added the follorinu Obserration.