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The Proof by Experinknts.<br />
l&p&. I. I iook 8 bhdr oblong fiiff Paper<br />
Jerminated by Parallel Sides, and with a Persndicular<br />
right Line drawn cl:ofi f.iom one<br />
ide to the other, diftinguiflred it into t\Tro c-<br />
qua1 Parts. One of thek parts I painted with<br />
red colour and the other with a blew., The’<br />
aper was very black, and the @o~ours intcnfc<br />
d thickly laid on, thtit the Pll~nonlcIlo~~<br />
might be more confpicuous. This l?a@~ ‘I<br />
iriew?d through a Prrfm of folid GIafs, wl~nik<br />
,two Sides through which the Light paGcd to the<br />
33ye were plane and well polifhed , and contained.<br />
an Angle of about fixty degrees: which .Angle<br />
I call the refra&ing Angle of the I’rffm. And<br />
whilfiIviewed it, 1 held it and the Tk3in before<br />
ti Window in fuch, manner that the Sides of 1.13~’<br />
aper were parallel to the Prifm, and both thoj:e<br />
Sides.and the Prifm were parallel to the Horizon9<br />
and the crofs Line was alfo parallel to it ; atId<br />
that the Light which fellfrom the WinCiow upor<br />
*the Paper made an Angle with the Paper, equal<br />
EQ that Angle which was made with the fame<br />
Pipe
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