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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
<
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
="
040/01/188.jpg
"
pagenum
="
170
"/>
offer upon ſome other day: but I would not have
<
emph
type
="
italics
"/>
Sagredus
<
emph.end
type
="
italics
"/>
<
lb
/>
fended at this digreſſion.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>I am rather very much pleaſed with it, for that I
<
lb
/>
member that when I ſtudied Logick, I could never comprehend that
<
lb
/>
ſo much cry'd up and moſt potent demonſtration of
<
emph
type
="
italics
"/>
Ariſtotle.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>Let us go on therefore; and let
<
emph
type
="
italics
"/>
Simplicius,
<
emph.end
type
="
italics
"/>
tell me
<
lb
/>
what that motion is which the ſtone maketh that is held faſt in the
<
lb
/>
ſlit of the ſling, when the boy ſwings it about to throw it a great
<
lb
/>
way?</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>The motion of the ſtone, ſo long as it is in the ſlit, is
<
lb
/>
circular, that is, moveth by the arch of a circle, whoſe ſtedfaſt
<
lb
/>
centre is the knitting of the ſhoulder, and its ſemi-diameter the arm
<
lb
/>
and ſtick.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>And when the ſtone leaveth the ſling, what is its
<
lb
/>
tion? </
s
>
<
s
>Doth it continue to follow its former circle, or doth it go
<
lb
/>
by another line?</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>It will continue no longer to ſwing round, for then it
<
lb
/>
would not go farther from the arm of the projicient, whereas
<
lb
/>
we ſee it go a great way off.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>With what motion doth it move then?</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>Give me a little time to think thereof; For I have
<
lb
/>
ver conſidered it before.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>Hark hither,
<
emph
type
="
italics
"/>
Sagredus
<
emph.end
type
="
italics
"/>
; this is the
<
emph
type
="
italics
"/>
Quoddam reminiſci
<
emph.end
type
="
italics
"/>
<
lb
/>
in a ſubject well underſtood. </
s
>
<
s
>You have pauſed a great while,
<
lb
/>
<
emph
type
="
italics
"/>
Simplicius.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>As far as I can ſee, the motion received in going out of
<
lb
/>
the ſling, can be no other than by a right line; nay, it muſt
<
lb
/>
ceſſarily be ſo, if we ſpeak of the pure adventitious
<
emph
type
="
italics
"/>
impetus.
<
emph.end
type
="
italics
"/>
I
<
lb
/>
was a little puzled to ſee it make an arch, but becauſe that arch
<
lb
/>
bended all the way upwards, and no other way, I conceive that
<
lb
/>
<
arrow.to.target
n
="
marg364
"/>
<
lb
/>
that incurvation cometh from the gravity of the ſtone, which
<
lb
/>
turally draweth it downwards. </
s
>
<
s
>The impreſſed
<
emph
type
="
italics
"/>
impetus,
<
emph.end
type
="
italics
"/>
I ſay,
<
lb
/>
without reſpecting the natural, is by a right line.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg364
"/>
<
emph
type
="
italics
"/>
The motion
<
lb
/>
preſſed by the
<
lb
/>
jicient is onely by a
<
lb
/>
right line.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>But by what right line? </
s
>
<
s
>Becauſe infinite, and towards
<
lb
/>
every ſide may be produced from the ſlit of the ſling, and from the
<
lb
/>
point of the ſtones ſeparation from the ſling.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>It moveth by that line which goeth directly from the
<
lb
/>
motion which the ſtone made in the ſling.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>The motion of the ſtone whilſt it was in the ſlit, you
<
lb
/>
have affirmed already to be circular; now circularity oppoſeth
<
lb
/>
directneſs, there not being in the circular line any part that is
<
lb
/>
rect or ſtreight.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP I mean not that the projected motion is direct in
<
lb
/>
ſpect of the whole circle, but in reference to that ultimate point,
<
lb
/>
where the circular motion determineth. </
s
>
<
s
>I know what I would </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>