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
Page concordance
<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 393
>
Scan
Original
21
3
22
4
23
5
24
6
25
7
26
8
27
9
28
10
29
11
30
12
31
13
32
14
33
15
34
16
35
17
36
18
37
19
38
20
39
21
40
22
41
23
42
24
43
25
44
26
45
27
46
28
47
29
48
30
49
31
50
32
<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 393
>
page
|<
<
(7)
of 393
>
>|
<
echo
version
="
1.0RC
">
<
text
xml:lang
="
la
"
type
="
free
">
<
div
xml:id
="
echoid-div9
"
type
="
section
"
level
="
1
"
n
="
9
">
<
pb
o
="
7
"
file
="
0025
"
n
="
25
"
rhead
="
"/>
<
p
>
<
s
xml:id
="
echoid-s362
"
xml:space
="
preserve
">VIII. </
s
>
<
s
xml:id
="
echoid-s363
"
xml:space
="
preserve
">1. </
s
>
<
s
xml:id
="
echoid-s364
"
xml:space
="
preserve
">Radii lucis (hoc eſt lucidi tranſitûs aut impulſùs quales de-
<
lb
/>
ſcripſimus tramites) in eodem exiſtentes ſimilari medio directi ſunt.
<
lb
/>
</
s
>
<
s
xml:id
="
echoid-s365
"
xml:space
="
preserve
">Hoc è dictis abunde patet. </
s
>
<
s
xml:id
="
echoid-s366
"
xml:space
="
preserve
">Quin indè Corollarii vice deducitur radios
<
lb
/>
quoad rem ipſam, Phyſicéque loquendo figurà priſmaticos eſſe, vel
<
lb
/>
cylindricos. </
s
>
<
s
xml:id
="
echoid-s367
"
xml:space
="
preserve
">Nempe corpuſculum illud quodpiam in lucidi ſuperficie
<
lb
/>
poſitum, à quo radius originem ſuam ducit, dum à primò ſuo loco ceu
<
lb
/>
baſe defertur aut totâ ſuâ ſuperficie contiguum ſibi corpus rectà propel-
<
lb
/>
lit, figuræ ſuæ (vel impulſi ſaltem corporis figuræ) congruum deſig-
<
lb
/>
nat, ſuper hac vel illa baſe conſtitutum, ſolidum longum, exile, teres,
<
lb
/>
quale cylindrus, aut priſma. </
s
>
<
s
xml:id
="
echoid-s368
"
xml:space
="
preserve
">Proinde quando Mathematicè rem tra-
<
lb
/>
ctamus, iſtos radios pro rectis lineis habere poſſumus; </
s
>
<
s
xml:id
="
echoid-s369
"
xml:space
="
preserve
">tum quia reve-
<
lb
/>
ra ſunt adeo tenues & </
s
>
<
s
xml:id
="
echoid-s370
"
xml:space
="
preserve
">recti; </
s
>
<
s
xml:id
="
echoid-s371
"
xml:space
="
preserve
">tum quia plerumque pro cylindricis ejuſ-
<
lb
/>
modi ſeu priſmaticis figuris ipſarum axes ità ſumi poſſunt, ut nihil indè
<
lb
/>
ratiocinio Mathematico derogetur.</
s
>
<
s
xml:id
="
echoid-s372
"
xml:space
="
preserve
"/>
</
p
>
<
p
>
<
s
xml:id
="
echoid-s373
"
xml:space
="
preserve
">IX. </
s
>
<
s
xml:id
="
echoid-s374
"
xml:space
="
preserve
">2. </
s
>
<
s
xml:id
="
echoid-s375
"
xml:space
="
preserve
">Ab omni corporis lucidi (vel illuſtrati) puncto ad quodvis
<
lb
/>
medii (non obſtaculis interciſi) punctum lucis aliquis radius dirigitur.
<
lb
/>
</
s
>
<
s
xml:id
="
echoid-s376
"
xml:space
="
preserve
">Hæc apud Opticos tritiſſima ſuppoſitio quò vel intelligi vel admitti
<
lb
/>
poſſit, omninò duplicem limitationem exigere videtur, è ſupra dictis
<
lb
/>
utramque deducibilem. </
s
>
<
s
xml:id
="
echoid-s377
"
xml:space
="
preserve
">Unam, ut omnis puncti nomine nedum non
<
lb
/>
præciſè punctum quodcunque Mathematicum, ac nec omnem particu-
<
lb
/>
lam concipiamus realem & </
s
>
<
s
xml:id
="
echoid-s378
"
xml:space
="
preserve
">Phyſicam; </
s
>
<
s
xml:id
="
echoid-s379
"
xml:space
="
preserve
">verùm ſaltem admodum exi-
<
lb
/>
guam, qualíque ferme minorem vel animo deſignare nequeamus; </
s
>
<
s
xml:id
="
echoid-s380
"
xml:space
="
preserve
">al-
<
lb
/>
teram ut non in unoquoque ſtrictè dicto temporis inſtanti, nec in omni
<
lb
/>
reali temporis portiuncula cogitemus hoc contingere, ſed ut nullum
<
lb
/>
temporis intervallum ſentiri poſſit ità curtum, aut momentaneum, quin
<
lb
/>
intra ipſum à quavis lucidi deſignabili parte deſignatam ad medii partem
<
lb
/>
radius aliquis exporrigatur. </
s
>
<
s
xml:id
="
echoid-s381
"
xml:space
="
preserve
">Enimverò cùm radiorum iſtæ quas aſ-
<
lb
/>
ſignavimus radices, lucidum componentia corpuſcula, ſint illorum,
<
lb
/>
quorum nos utcunque quantitates ſenſu vel animo pertingere valemus,
<
lb
/>
corporum reſpectu tanquam infinitè parva, nec non infinità quaſi per-
<
lb
/>
nicitate donata, non difficilè concipi poteſt in omni deſignabili, vel
<
lb
/>
imaginabili lucentis ſpatiolo prorſus innumerabilem eorum multitudi-
<
lb
/>
tudinem exiſtere, quorum fere ſingula diverſas in plagas tendunt; </
s
>
<
s
xml:id
="
echoid-s382
"
xml:space
="
preserve
">ut
<
lb
/>
nulla ſit deſignabilis plaga, quam non una quæpiam appetat, aliquam
<
lb
/>
ſaltem, utlibèt imperceptibilis & </
s
>
<
s
xml:id
="
echoid-s383
"
xml:space
="
preserve
">anguſti, temporis moram interpo-
<
lb
/>
nendo. </
s
>
<
s
xml:id
="
echoid-s384
"
xml:space
="
preserve
">In eo ſiquidem tempuſculo lucidi partes ſingulas innumera
<
lb
/>
ſucceſſivè talia corpuſcula ſubingrediuntur juxta deſerúntque, de qui-
<
lb
/>
bus mirum fuerit ni quoddam unum ad deſignatum medii ſpatium ten-
<
lb
/>
dat, ſibi tranſmittendo meatuum aliquem (quos & </
s
>
<
s
xml:id
="
echoid-s385
"
xml:space
="
preserve
">pari ratione </
s
>
</
p
>
</
div
>
</
text
>
</
echo
>