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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 8, page id 1677894601:0180
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determinins some others o the Follovins Obserra.
LIOIS.
OBS. V1
Phe Diameter oF the Exth Rins at the most lucid
Part oF its Orbit ras 5 parts ot an luch, and the Dia-
meter ot the Sphere on which the double conrex Ob.
ject.Clals mas sround ras about 102 Feet, and hence
lgathered the thickness of the Air or Aereal Interval
ot the Glasses at that Ring. But lome time alter, suI-
pectins that in makins this Obserration I had not de-
termined the Diameter of the Sphere writh sufficient ac-
curatenels, and beins uncertain rhether che Plano-
conrex Cilass iras truls plain, and not Comethins con-
care or conrex on that side irhich l’accounted plain;
and irhether Lhad not pressed the Gilasses together, 25
Potten did, to make them touch. (For by prestins luch
Classes together their parts catily vield inmards, and
the Rings thereby become sensibly broader than they
vouldbe, did the Cilasses kecp their Figures.) I re-
Peated the Lxperiment, and tound the Diameter ot
the lixtl lucid Rins about;es parts ot an Iuch. Iic-
Peated the Experiment allo rith such an Object- (ila(5
OF another Telelcope as Phad at hand. Pnis rras a double
conrex sround on both sides to onc and che lame
Sphere, and its Locus ras distant trom it 83: Tuches.
And thence, il the sines ot incidence and retraction ot
the bright vellorr Lisht be altumed in proportion 25
1I to 17, the Diamerer ot the Sphere to erhich the
Class as figured rill by computation be Found 182 In-
ches. This Cilass L laid upon a Aat one, (o that the
black