Tum fic opus, grandi tenuem rem crefcere mole 2035
Ut faciat, parvumque ideo ftruere , atque locare
Rem prope : ac ofTcnfum radiis redeuntibus ipfa
Res fac ia t, fpeculum fiquidem tega t, & finat ullos
Non oculum radios impellere poffc reflexos ,
Vel longe paucos, ncc quos fentire queamus ;
204.Q
Ncc facile ipfam rem luci , quam debet habere ,
( Obftct idem fpeculum nam partim ) exponere poffis.
Srepc tamen fpeculis n ihilo minus uticr ipfis
Ille opus eft, verum planis, varieque locatis-,
Corpora qure multa poffint infpergcrc lucc
204$
Tenuia detorta , vel qua: convertere poffint
Quo radios vis cumque eruptos lentibus, atque
Projicere, & quovis rerum deferre figuras.
Sic 1 quoque in obfcuro thalamo fi adjungere rimre
Exili tentes tubulum hunc , extraque fencftrx
2050
Adfixum fpeculum fic vertere , folis ut idus
EsMccptos intro rima tranfm ittat aperta
Scilicet in tubulum , quam dum lux fulgida tran a t,
Incidat in claufani tenuem rem , protinus umbra
Hujus adau&a fugit,thalamumquc irrumpit in ipfum ;
2055
Excipitur nivea fi jam fuper illa papyro,
Corporis efficiet fimulacrum grande pu filli,
Tan-
L I B E R O C T A V U S .
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tad ioptrica
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in fo c o fp c c u li c a v i
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ita radii digrcfli a fin g u lis e j u s
p u n tiis re d e u n t pa ra lle li , & fic
m ic ro fc o p iu m f i m p l e x , v e l c o n
verge n te s ,
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criam o p o r te t a u g e r e v im l u m i
nis ad h a b e n d a m c la rita te m . N o
tan d um a u te m illud m u lto m i n o
rem a m p lific a tio n e m o b t in e r i p e r
h x c m icro fco p ia , q u a m p e r d i o -
ptrica > q u ia fi fp c c u lu m fit n i
m is c a v u m , o p o r te t itid e m fit
p erquam e x ig u u m : tu m v e r o ra
dii a fp ecu lo re d e u n te s i n t e r c i
p iu n tu r ab ip fo o b j e f t o j q u in dc-*
v e n ir e p o ffin t a d o c u l u m , v e l
a d o c u la re s l e n t e s .
1 H i c in n u it illu d , q u o d a p p e l
la n t m ic r o fc o p iu m fo la r c : a p p li
c a t u r ad fo r a m e n f e n c f t r x tu b u s,
q u i e x t r a ip fam h a b e t fp c c u lu m
p la n u m , q u o d
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fi
p e r p e n d ic u la r e m d irig it
ra
d iu m lo la r c m q u o c u m q u e lib e at
in t r a c o n c la v e : ipfi t u b o a p p lica -
c a tu r in tra ip fu m c o n c la v e m i
c r o f c o p iu m , p er q u o d tra n fm ir -
t u n t u r
ra d ii , q u o r u m i i , q u i
in c id u n t in o b j e d u m p o fitu m lo
c o d e b i t o , in te rc e p ti d e te r m in a n t
in p a rie te o p p o fit o , v e l in c a rta
cb jctfta u m b r a m re fe r e n te m im a
g i n e m d ift in & a m o b je d ii ipfius ,
c o m a jo r e m , q u o u m b r a e x c i
p itu r in p U n o r e m o t i o r e ,
