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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 103, page id 1677894601:0279
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=279
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ut a
IEthele Rines thusdepend on thethickness oF the plate
oFCilaIs their Diametere at equal distances trom several
Speculums made ot tuch concaro conrex plates oF Cilals
as are ground on tlie lame Sphere, oushit to be recipro-
cally in a lubduplicate proportion of the thieknestes ot
the plates of CtaIS. And if this proportion befound
true by experience it ill amount to a demonstration
that thele Rings (like thole Formed in thin plates) do
depend on thethicknels oF the Cila(s. I procured there
tore another concaro conrex plate OE Cilals groundt On
both Sides to the lame Sphere rith the former plate:
les thickness iras 3. Parts ot an Inch; and the Diameters
oF the three Arst brishe Rinss mealured betreen the
brightest parts of their orbits at the distance ot 6 Feet
From the Cla(S ivere 3. 45. 55. Inches. Now thethick-
vess of the other Cilass beins : oF an Inch Wras to thick-
nels oF this CElaIS 45 = t0 3.3 that 15 45 3T t0 1O, Or
370000000 t0 100000000 and the roots ot chele numbers
arc 17607 and 10000, e in the proportion ofthe Arst.
oF these ioots to the second are the Diameters ot the
brishe Rings made in this Obserration by the thinner
GIa(S, 3. 45. 55to the Diameters oF the lame Ringsmade
in the third oCthele Obserrations by the thicker Clals
16. 25 212 That is, the Diameters ot the Rings are reci
procally in a subduplicate proportion of thicknesles oE
the plates oF CilalS.
S0 then in plates ot GElaIS which are alike concave On.
one side, and alike convex on the other side, and alike
quick.silrered on the convex sides, and differ in nothine
buE
E