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fmflinn in a given Proportion, aS We ffIeW’d in<br />
0~11’ I)tincip!cs of Philofbph!; : And this RLtle is<br />
me by bqwicncc. The Raps of Light in<br />
pii-lg our of Glak inro a P2cz1wz, are bent to-<br />
W~II& the Gl& ; and if they E111 too obliquely<br />
011 the 3-‘;7~‘i~lfit~ they are bent bacl~wards into<br />
tllc Gifll?, Lllld tOtilllj’ Klcdtd ; Cltld this Ke1lesion<br />
~ai~~0t be afcribcti to the Reiillance of 312<br />
abfi,lute K~xa.!itm ) but muit 1x2 eaufcd by the<br />
Po\Ver of the GlilfS ~ttlYI~~til1~ the RAYS 2lt t-heir<br />
going out of it into the t/;I’~~~~twz, and bringing<br />
them bdL For if the fxther Suiifhce of the<br />
G!aF be nioilten’d jvith ‘:\‘atcr of clear Oil, or<br />
liy:ki md clear E-Ioney ; tlxK:~ys which would<br />
othcrwiik be refk3%d, will go ho the Water,<br />
Oil, or Honep, and therefore are not refle&d<br />
before they arrive at the farther Surf&x of the<br />
Glafs, and begin to go out of it. If they go out<br />
of it into the Water, Oil or Honey, they<br />
go on) bCCilLlfe the Attra&ion of the Glafs is<br />
almoit balanced and render’d ineffktual by<br />
the COllt~ilr)rAtt~R~tiOn of the Liquor. IBut if<br />
they go out of it into a ?&zci~~~fl which has no<br />
At&&ion to bal;n~c that of the Glai‘s, the Attraition<br />
of the GM’s either bends and refra&<br />
them, or brings them back and refle&s them.<br />
And this is Ml more evident by laying together<br />
tIYo Priftns of Glafs, or two OJ.3je8-glafTes of<br />
of very long “Felekopes, the one plane the o-<br />
ther a-little convex, and fo compreffing them<br />
that they do not f~dly touch, nor are too far a-<br />
SUlldc;L For the LCght which falls upon the<br />
fixther Surf&e of the firft Glafs where tile Interval<br />
between the Glafks is not above the ten<br />
hundred
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