Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Notes
Handwritten
Figures
Content
Thumbnails
Table of figures
<
1 - 30
31 - 40
>
[Figure 21]
Page: 172
[Figure 22]
Page: 175
[Figure 23]
Page: 178
[Figure 24]
Page: 181
[Figure 25]
Page: 184
[Figure 26]
Page: 187
[Figure 27]
Page: 190
[Figure 28]
Page: 349
[Figure 29]
Page: 352
[Figure 30]
Page: 355
[Figure 31]
Page: 358
[Figure 32]
Page: 361
[Figure 33]
Page: 364
[Figure 34]
Page: 367
[Figure 35]
Page: 370
[Figure 36]
Page: 373
[Figure 37]
Page: 376
[Figure 38]
Page: 379
[Figure 39]
Page: 382
[Figure 40]
Page: 385
<
1 - 30
31 - 40
>
page
|<
<
(3)
of 393
>
>|
<
echo
version
="
1.0RC
">
<
text
xml:lang
="
la
"
type
="
free
">
<
div
xml:id
="
echoid-div9
"
type
="
section
"
level
="
1
"
n
="
9
">
<
p
>
<
s
xml:id
="
echoid-s238
"
xml:space
="
preserve
">
<
pb
o
="
3
"
file
="
0021
"
n
="
21
"
rhead
="
"/>
_Democrito_ jam olim, ejúſque ſequaci (dicam an ſimio? </
s
>
<
s
xml:id
="
echoid-s239
"
xml:space
="
preserve
">) ſuboluer@t
<
lb
/>
_Epicu
<
unsure
/>
ro_. </
s
>
<
s
xml:id
="
echoid-s240
"
xml:space
="
preserve
">Quod ſanè malim adſumere, vel ſupponere, quam poſt tot
<
lb
/>
alios operoſo niſu comprobare. </
s
>
<
s
xml:id
="
echoid-s241
"
xml:space
="
preserve
">Certè (quo breviſſimè tangam hanc
<
lb
/>
quæſtionem) ſic in alia qualibet evenit ſenſione, (quidni pariter in vi-
<
lb
/>
ſu?) </
s
>
<
s
xml:id
="
echoid-s242
"
xml:space
="
preserve
">non ut ſenſus in objecta feratur, ſed ut ipſa ſe ſenſibus imprimant;
<
lb
/>
</
s
>
<
s
xml:id
="
echoid-s243
"
xml:space
="
preserve
">immediato nempe contactu, vel medii cujuſdam ſeu projecti, ſeu com-
<
lb
/>
moti interventu. </
s
>
<
s
xml:id
="
echoid-s244
"
xml:space
="
preserve
">Tum ratio vetat, ut ex ocello quicquam in immenſam
<
lb
/>
adeò circumquaque diſtantiam credamus emanare; </
s
>
<
s
xml:id
="
echoid-s245
"
xml:space
="
preserve
">neque quod ſic
<
lb
/>
emanet in eo quidpiam aptum natum deprehendimus. </
s
>
<
s
xml:id
="
echoid-s246
"
xml:space
="
preserve
">Totus enim-
<
lb
/>
vero pellucidis humoribus aut membranulis conſtat opacis, ad tranſ-
<
lb
/>
mittendam lucem, vel ad eam excipiendam, aptiſſimè, ſed ad progig-
<
lb
/>
nendam à ſe vel ejaculandam haudquaquam comparatis. </
s
>
<
s
xml:id
="
echoid-s247
"
xml:space
="
preserve
">Quòd ſi lu-
<
lb
/>
cem ipſe profunderet, inſitiſque radiis attingeret objecta, quidniden-
<
lb
/>
ſiſſimis in tenebris hoc præſertim faceret, & </
s
>
<
s
xml:id
="
echoid-s248
"
xml:space
="
preserve
">feles vel (Hiſtoricis ſi
<
lb
/>
placet) _Tiberii_ fieremus omnes? </
s
>
<
s
xml:id
="
echoid-s249
"
xml:space
="
preserve
">Quæ, dico, lucis externæ tam indiſ-
<
lb
/>
penſabilis ad viſum neceſſitas eſſet? </
s
>
<
s
xml:id
="
echoid-s250
"
xml:space
="
preserve
">συνωγας equidem Platonicæ. </
s
>
<
s
xml:id
="
echoid-s251
"
xml:space
="
preserve
">
<
lb
/>
Sonum audio, vim non capio. </
s
>
<
s
xml:id
="
echoid-s252
"
xml:space
="
preserve
">Demum ab objectis, etiam à tergo ſitis,
<
lb
/>
circumfuſas ſpecies quas vocant, ad oculos deportari, ſuíque percep-
<
lb
/>
tionem efficere, cùm à ſpeculis, tum ab aliis innumeris perquam ob-
<
lb
/>
viis experimentis compertum habetur; </
s
>
<
s
xml:id
="
echoid-s253
"
xml:space
="
preserve
">illarum igitur eſſicaciæ quidni
<
lb
/>
commodiſſimè viſionem adſcribamus? </
s
>
<
s
xml:id
="
echoid-s254
"
xml:space
="
preserve
">ſatìs hæc illam quam adſumimus
<
lb
/>
vulgarem jam hypotheſin adſtruunt, quam & </
s
>
<
s
xml:id
="
echoid-s255
"
xml:space
="
preserve
">totus dicendorum tenor
<
lb
/>
luculentè confirmabit.</
s
>
<
s
xml:id
="
echoid-s256
"
xml:space
="
preserve
"/>
</
p
>
<
p
>
<
s
xml:id
="
echoid-s257
"
xml:space
="
preserve
">V. </
s
>
<
s
xml:id
="
echoid-s258
"
xml:space
="
preserve
">Cùm verò multa viſum aſſiciant diverſimode, puta lux, lumen,
<
lb
/>
dies, crepuſculum, colores,
<
unsure
/>
rerum imagines, phaſmata; </
s
>
<
s
xml:id
="
echoid-s259
"
xml:space
="
preserve
">nec tamen
<
lb
/>
abſque luce. </
s
>
<
s
xml:id
="
echoid-s260
"
xml:space
="
preserve
">(Præſente nimirum aut prævia) quidvis horum aliquid
<
lb
/>
peragat, perſpicuum eſt lucis hîc præcipuas partes, primariam effica-
<
lb
/>
ciam fore. </
s
>
<
s
xml:id
="
echoid-s261
"
xml:space
="
preserve
">Quinimo rem ſedulò penſitantes, eò deveniemus, opinor,
<
lb
/>
ut varias his omnibus adnexas apparentias non aliunde quàm ex diverſi-
<
lb
/>
modâ lucis unius operatione putemus proficiſci. </
s
>
<
s
xml:id
="
echoid-s262
"
xml:space
="
preserve
">Cùm nempe lux ſit
<
lb
/>
illud quicquid ſit quod à corpore lucido (quale ſtella, ignis, flamma)
<
lb
/>
proveniens immediatè viſum afficit, lumen nil videtur aliud quàm lux
<
lb
/>
in corpuſcula quædam opaca (ſeu lucem non penitùs excipientia)
<
lb
/>
πς ωειΕΧονη interſperſa impingens, nec non ab iis in omnes undique
<
lb
/>
partes reſiliens; </
s
>
<
s
xml:id
="
echoid-s263
"
xml:space
="
preserve
">quæ ſcilicet in oculum itineri ſuo expoſitum tumultu-
<
lb
/>
ariè delapſa confuſam quandam apparentiam excitat; </
s
>
<
s
xml:id
="
echoid-s264
"
xml:space
="
preserve
">quàm, ſi fortior
<
lb
/>
ſit, eique prorogandæ lucens præſtò ſit, appellamus diem; </
s
>
<
s
xml:id
="
echoid-s265
"
xml:space
="
preserve
">at ſi de-
<
lb
/>
bilior fuerit, ejúſque fons abſceſſerit, crepuſculum dicimus. </
s
>
<
s
xml:id
="
echoid-s266
"
xml:space
="
preserve
">Etiam
<
lb
/>
color nil fermè videtur aliud, quam lux à corporibus quibus </
s
>
</
p
>
</
div
>
</
text
>
</
echo
>