Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
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 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
601 - 630
631 - 660
661 - 690
691 - 701
>
Scan
Original
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
<
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 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
601 - 630
631 - 660
661 - 690
691 - 701
>
page
|<
<
of 701
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
xlink:href
="
040/01/161.jpg
"
pagenum
="
143
"/>
I will not conſent that our Poem ſhould be ſo confined to that
<
lb
/>
unity, as not to leave us fields open for Epſody's, which every
<
lb
/>
ſmall connection ſhould ſuffice to introduce; but with almoſt as
<
lb
/>
much liberry as if we were met to tell ſtories, it ſhall be lawful
<
lb
/>
for me to ſpeak, what ever your diſcourſe brings into my mind.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>I like this motion very well; and ſince we are at this
<
lb
/>
liberty, let me take leave, before we paſſe any farther to ask of
<
lb
/>
you
<
emph
type
="
italics
"/>
Salviatus,
<
emph.end
type
="
italics
"/>
whether you did ever conſider what that line may
<
lb
/>
be that is deſcribed by the grave moveable naturally falling down
<
lb
/>
from the top of a Tower; and if you have reflected on it, be
<
lb
/>
pleaſed to tell me what you think thereof.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>I have ſometimes conſidered of it, and make no
<
lb
/>
ſtion, that if one could be certain of the nature of that motion
<
lb
/>
wherewith the grave body deſcendeth to approach the centre of
<
lb
/>
the Terreſtrial Globe, mixing it ſelf afterwards with the common
<
lb
/>
circular motion of the diurnal converſion; it might be exactly
<
lb
/>
found what kind of line that is, that the centre of gravity of the
<
lb
/>
moveable deſcribeth in thoſe two motions.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>Touching the ſimple motion towards the centre
<
lb
/>
pendent on the gravity, I think that one may confidently,
<
lb
/>
out error, believe that it is by a right line, as it would be, were
<
lb
/>
the Earth immoveable.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>As to this particular, we may not onely believe it, but
<
lb
/>
experience rendereth us certain of the ſame.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>But how doth experience aſſure us thereof, if we
<
lb
/>
ver ſee any motions but ſuch as are compoſed of the two, circular
<
lb
/>
and deſcending.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>Nay rather
<
emph
type
="
italics
"/>
Sagredus
<
emph.end
type
="
italics
"/>
we onely ſee the ſimple motion of
<
lb
/>
deſcent; ſince that other circular one common to the Earth, the
<
lb
/>
Tower and our ſelves remains imperceptible, and as if it never
<
lb
/>
were, and there remaineth perceptible to us that of the ſtone,
<
lb
/>
ly not participated by us, and for this, ſenſe demonſtrateth that
<
lb
/>
it is by a right line, ever parallel to the ſaid Tower, which is
<
lb
/>
built upright and perpendicular upon the Terreſtrial ſurface.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>You are in the right; and this was but too plainly
<
lb
/>
monſtrated to me even now, ſeeing that I could not remember ſo
<
lb
/>
eaſie a thing; but this being ſo manifeſt, what more is it that you
<
lb
/>
ſay you deſire, for underſtanding the nature of this motion
<
lb
/>
downwards?</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>It ſufficeth not to know that it is ſtreight, but its
<
lb
/>
ſite to know whether it be uniform, or irregular; that is,
<
lb
/>
ther it maintain alwayes one and the ſame velocity, or elſe goeth
<
lb
/>
retarding or accelerating.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>It is already clear, that it goeth continually
<
lb
/>
rating.</
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>