Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Thumbnails
List of thumbnails
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 680
681 - 690
691 - 700
701 - 701
>
431
432
433
434
435
436
437
438
439
440
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 680
681 - 690
691 - 700
701 - 701
>
page
|<
<
of 701
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
pb
xlink:href
="
040/01/440.jpg
"
pagenum
="
418
"/>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>I will uſe my utmoſt endeavours to render my ſelf
<
lb
/>
<
arrow.to.target
n
="
marg813
"/>
<
lb
/>
intelligible, but the difficulty of the accident it ſelf, and the
<
lb
/>
great attention of mind requiſite for the comprehending of it,
<
lb
/>
conſtrains me to be obſcure. </
s
>
<
s
>The unequalities of the additions
<
lb
/>
and ſubſtractions, that the diurnal motion maketh to or from
<
lb
/>
the annual dependeth upon the inclination of the Axis of the
<
lb
/>
urnal motion upon the plane of the Grand Orb, or, if you pleaſe,
<
lb
/>
of the Ecliptick; by means of which inclination the Equinoctial
<
lb
/>
interſecteth the ſaid Ecliptick, remaining inclined and oblique
<
lb
/>
upon the ſame according to the ſaid inclination of Axis. </
s
>
<
s
>And the
<
lb
/>
quantity of the additions importeth as much as the whole
<
lb
/>
ter of the ſaid Equinoctial, the Earths centre being at the ſame
<
lb
/>
time in the Solſtitial points; but being out of them it importeth
<
lb
/>
leſſe and leſſe, according as the ſaid centre ſucceſſively
<
lb
/>
cheth to the points of the Equinoxes, where thoſe additions are
<
lb
/>
leſſer than in any other places. </
s
>
<
s
>This is the whole buſineſſe, but
<
lb
/>
wrapt up in the obſcurity that you ſee.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg813
"/>
<
emph
type
="
italics
"/>
The cauſes of
<
lb
/>
the inequality of
<
lb
/>
the additions and
<
lb
/>
ſubſtractions of the
<
lb
/>
diurnal converſion
<
lb
/>
from the annual
<
lb
/>
motion.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>Rather in that which I do no not ſee; for hitherto I
<
lb
/>
comprehend nothing at all.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>I have already foretold it. </
s
>
<
s
>Nevertheleſſe we will try
<
lb
/>
whether by drawing a Diagram thereof, we can give ſome
<
lb
/>
ſmall light to the ſame; though indeed it might better be ſet
<
lb
/>
forth by ſolid bodies than by bare Schemes; yet we will help our
<
lb
/>
ſelves with Perſpective and fore-ſhortning. </
s
>
<
s
>Let us draw
<
lb
/>
fore, as before, the circumference of the Grand Orb, [
<
emph
type
="
italics
"/>
as in
<
lb
/>
Fig.
<
emph.end
type
="
italics
"/>
4.] in which the point A is underſtood to be one of the
<
lb
/>
Solſtitials, and the diameter A P the common Section of the
<
lb
/>
Solſtitial Colure, and of the plane of the Grand Orb or
<
lb
/>
tick; and in that ſame point A let us ſuppoſe the centre of the
<
lb
/>
Terreſtrial Globe to be placed, the Axis of which C A B,
<
lb
/>
clined upon the Plane of the Grand Orb, falleth on the plane of
<
lb
/>
the ſaid Colure that paſſeth thorow both the Axis of the
<
lb
/>
ctial, and of the Ecliptick. </
s
>
<
s
>And for to prevent confuſion, let
<
lb
/>
us only draw the Equinoctial circle, marking it with theſe
<
lb
/>
cters D G E F, the common ſection of which, with the plane of
<
lb
/>
the grand Orb, let be the line D E, ſo that half of the ſaid
<
lb
/>
quinoctial D F E will remain inclined below the plane of the
<
lb
/>
Grand Orb, and the other half D G E elevated above. </
s
>
<
s
>Let
<
lb
/>
now the Revolution of the ſaid Equinoctial be made, according
<
lb
/>
to the order of the points D G E F, and the motion of the
<
lb
/>
tre from A towards E. </
s
>
<
s
>And becauſe the centre of the Earth
<
lb
/>
being in A, the Axis C B (which is erect upon the diameter of
<
lb
/>
the Equinoctial D E) falleth, as hath been ſaid, in the
<
lb
/>
tial Colure, the common Section of which and of the
<
lb
/>
Grand Orb, is the diameter P A, the ſaid line P A ſhall </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>