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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 36, page id 1677894601:0208
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(367
tine ot vellon and orange, and these thicknesses will
DCGu Gv CE, C0, 67. And this beins KnoWn, it i5
easy to determine irtrat thickness of Air is represented
by C_ Or by any otter distance of the ruler trom
A II.
But Further, since by the roth Obserration the thick
ness oF Air iras to the thicknels oF Water, which DC
treen the Came CElasses exhribited the lame COlOur, 25
4t03, and by the 2ith Obserration the Colours ot
thin bodies are not varied by varrins the ambient me-
dium; the thickness ot a Bubble ot Water, extribiting
any Colour, will be3 oF the thicknels oF Air producins
thc Came Colour. And so according to the Tame Foch
and 2rth Obserrations the thickness oF a plate or
Olals, Wrhose refraction ot the mean retrangible ray, is
meatured by the proportion of the Sines 31 to 20,
may BC ~ oF the chickness oF Air producing the Came
ColOurS; and the like oF other mediums. I do not
attirm, that this proportion oF 20 +0 ZF, holds in aII
the cayS; For the Sines ot other Ports et rays hare other
Droportions. But the differences oF thole propOrtions
are (0. litele that I do not here consider them. On
chese Crounds I hare composed the tollowing Pable,
irherein the thickness oF AIT, Water, and GEla(S, aE
erhich each Colour is most intense and specitick, is ex
pressed in parts ot an Inch dirided into Ten hundred
chousand equat parts.
L BC