Quid prope funt , nifi quos fupcra jam diximus effe 2015
Pluribus inftruftos vitris , longcque tuentes,
lnvcrfos tubulos tamen ? hic convexior extat
Lens, qua: prima, ad rem quasque eft converfa propinquam;
Altera lens propior non tam tumet, ut neque porro
A lte r a ,
q u x
media interdum in regione locatur. 2020
H tc quoque perfacile eft cognofcere, quidquid oportet.
U t diftinfte fimul rerum fit , & aucta figura,
Scilicet ut fupera jam di&um e ft; clara fed effe
Non po terit, lumen nifi deflammante lucerna
Excipias lente exterius, nimiumque coadtum
2025
Rem fuper immittas , vel (olis lumina denfa
Projcd^es in rem fpeculo , vel ad aeris auras
Candentes fpedes , pulfataque moenia fole
Ipfam convertens rem, fi pellucida conftct.
Semper & ut fpecies permagno poffit adauflu
2030
Crcfcere, convexam lentem nimis effe neceffe eft ,
Qure prior, exteriorque, focumque adftarc propinquum.
Proin 1fpeculum fi jam pro lente adhibere cavatum
Hic tentes, nimium certe, nimiumque cavare
Tum
21
6
P H I L O S O P H I ®
cedit le n t ic u la , in qua q u id em
tan to m in o re d ift a n t ia , fi id o c u
lo in erm i fiftc r c m u s , vifio effet
c o n f u f a .
M ic ro fc o p ia fecundi gen eris funt
quaedam in v e rfa telefcopia : col
lo c a tu r p rope o b je & u m lens adm o
d u m co n v e x a , tum prope o cu lu m
a lia m u lto m in u s , vel e tiam bi-
c x . E o cafu o b jc & u m ftatuicur
in d iftan tia paullo m ajore a len
tic u la illa o b je d t iv a , q u am fit
e ju s focus : fic radii progreffi a
q u o v is un ico o b je tti pundto co
e u n t in q u ad am d iftan tia a b ipfa
len te , in q u a im a g o p in gitu r :
ib i debet e u e focus citerior len
tis o c u la ris , vel totius fyftcm a-
tis o cu la rium , u t ii radii ab ipfis
red d an tur p a r a lle li, quod perti
n e t ad d iftin & io n cm
R a d ii au
tem f i n g u l i , qui d even iunt e lin
gu lis diverfis p u n & is o b jc & i, poft-
e a q u am fc dccuffarunt intra p ri
m a m len ticulam o b je & iy x in , ubi
c o n tin e n t a n g u lu m v ifu a lc m c ju s
m agn itu d in is , cujus is h a b e re tu r,
fi o c u lu m ibi poffem us collocare ,
iterum d eto rqu en tu r in tro rfu m ab
o c u l a r i , vel ocu larib u s a u & o e o
a n g u l o , a q u o pendet am p lifica
tio . Po rro ad h ab e n d am in g e n
tem am plificatio nem fem p er de
bet haberi p rop e o b jc & u m lens
a dm o d u m c o n v e x a , cui id pof
fit q u a m p r o x im e a d m o v e r i . A c
ad h ab en d am c u m a m p lificatio n e
claritatem , o p o rte t illu m in a re
o b jc & u m m ajore lum in is v i , re
flexa n im irum op e fp cculo rum ,
vel c o lle & a ope len tium a p p o fi-
tarum ad la tus, v el fi o b jc & u m
fit fe m id ia p h a n u m , tranfpiccrc
con tra lum en v iv id u m atm ofphre-
ix
, a u t parietis bene illu m in ati
a fole. E a om n ia hic N o ft e r in n uic
ra n tu m m o d o , n c nim is in im
m e n fu m res a b e a t .
In n u it d em u m ta n tu m m o d o ,
qure p c itic c n c ad m icro fco p ia
