Parte una quater e centenis; c regione
Qu i radius pofitas res reit i nuper adibat,
Atque hinc, atque illinc geminos disjungitur unus
In traftus; media umbra mance, jamque amplior, ipfis
Ufque magis cultris ad fe accedentibus: at funt
i8 x j*
Luminis arctati tradtus mage ; nempe patefeie
Queis magis umbra, locis hi diminuentur in illis:
Donec cultorum in contadlu denique lucis
Definat hrec fpcciei bifida:, & nox omnia velet.
Qua: detorta minus pars luminis, interiores
1829
Et caudarum oras tingit, majore meare
Nonne vides fpatio a cultris debere, videri
Vjxque umbra incipiet media, id quod majus habetur
Tum fpatium , partem prope pollicis unius illam
Prendere, qure jam pars ocLngentcdma condet?
1825
Inflexum magis e ft, propius quod currit acutam
Prreter cultri aciem lumen, caudrequc remotas
A media partes illabcns imbuit ora .
Ante 1 accedentes acies quam mutua poffent
Umbram inter geminos caudarum immittere tradus, 183.9
Fimbria terna etiam hinc atque illinc ordine vila
Eft gemino , cure quo thalami majore foramen
An-
,, tandem fc inter fc c o n tin g e re n t,
,, lum en totum pen itus evan cfec-
,, ret in u m b ra m . ,,
P orro inde jure c o lligit N o ft e r
c u m N e w t o n o id lu m i n i s , q u o d
eft m im is in flexum , tranfire in
m a jo re d iftan tia a cultris : i d *
q uod p rim o f u r r ip it u r , ubi u m r
1
b ra incipit , debet utique diftare
per dijnidium intervalli
9
1 im iru m per
g i - l i n e r e : tu m
re liquum , qu o m agis accedit a d
c u l t r o s , eo in flefti m agis : p o
ftre m u m enim evanefeit , q u o d
m a x im e d iftabat ab u m b r a .
1 ln o b fe rv a tio n e fu p e rio re v i
dere eft etiam tres illas c o lo r a
tas fim b r ia s , tam h i n c , quarn
inde * q u a ru m fin gula te rn a ria
fin gulis d eb en tu r c u le r is : de his
agit. N e w t o n u s in o b fe ry a tio n e 7*
3
o4
P H I L O S O P H I A
m ul cultros, cj-qfque pars aliqua
,, inter acies ip forum tranfrnit-
„ t e r e tu r . C u m q u e acies ip forum
d iftaren t jam inter fe circi-
9J
ter ~ parte u n cire , radius
„ in ter acies tranfm iflus disperti-
#, v it fc m ed iu m in binas par-
0,
t e s , u m b ra m q u e re liquit bi-
9i
n is jftis lui p a rtib u s in terja-
c e n tc m : u m b ra illa adeo n ig r a
9, .e r a t, & ten ebro fa , u t lu m e n
0,
id o m n e p r o r f u s , q u o d in ter
cultros tr a n fir e t , in fle x u m y i-
0t
d e r e t u r ,
&c
vel in hanc , vel
9,
in illam partem in tortum : &.
9t
p ro u t cultri ad fc in vicem p r o -
pius a d m o v e re n tu r, ita u m b ra
illa la tio r erat f a f l a , radiatio-
n c fq u c anccdiftre co n tra h e b an t
„
fe in bre vita tem aV in terio ri-
#> bu s fuis .extrem itatibus p ro p iu s
£>
umbram5 donec, cum cultri
