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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 27, page id 1677894601:0199
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became more faint and languid; especially by wettins
ehre plates on that hide oppolite tothe Lve: But Lcoutd.
not perceire any variation ot their species. So then
the thickness ot a plate requisite to produce any C0
Tour, depends outr on the densier ot the plate, and
not on that of the ambient medium: And hence, by the
Toch and rbth Obserrations, mar be known thethick-
nels irhich BubbleS OFWater, or Plates oF Muscory.
BalS, Or Other substances, have at any C Olour Pio.
duced by them.
OBS. XXII.
A thin transparent Body, irhich is denser than its
ambient medium, exhribits more brisque and virid C0-
Tours than chat irtrich is so much rarer; 25 l have
particularly observed in the Aic and Gila(S. For blon-
ins Class very thin at a Lamp. Furnace, thole plates
incompassed rith Air did exhibit Colours much
more ririd than thole ot Air made thin betreen tro
Crlases.
OB5. ZXIII.
Comparins the quantier ot Light reflected From the
several Rings, I Found chac it ras most copious trom
the Arst or inmost, and in the exterior Rings De-
came sradually less and lels. AIIO the irhitenels ot
thC Arst Rins as Sronger than chat reftected from
thole pares oF the thinner medium irhich ivere with
out the RinES; as I could manifestly perceire by rien-
ins ac a dittance che Rings made by the tro bject
ti. C 2
ClaACS,