Galilei, Galileo
,
The systems of the world
,
1661
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<
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065/01/234.jpg
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pagenum
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226
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<
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<
s
>SAGR. </
s
>
<
s
>I may then, it ſeems, for once prove a Maſter to you both.
<
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</
s
>
<
s
>And becauſe the proceeding by interrogatories doth in my opinion
<
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much dilucidate things, beſides the pleaſure which it affords of
<
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founding our companion, forcing from him that which he thought he
<
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knew not, I will make uſe of that artifice. </
s
>
<
s
>And firſt, I ſuppoſe that the
<
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Ship, Gally, or other Veſſel, which we would diſcover, is a great way
<
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off, that is, four, ſix, ten, or twenty ^{*} miles, for that to kenne thoſe
<
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<
arrow.to.target
n
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"/>
<
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neer at hand there is no need of theſe Glaſſes: & conſequently, the
<
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<
emph
type
="
italics
"/>
Teleſcope
<
emph.end
type
="
italics
"/>
may at ſuch a diſtance of four or ſix miles conveniently
<
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diſcover the whole Veſſel, & a muchgreater bulk. </
s
>
<
s
>Now I demand
<
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what for ſpecies, & how many for number are the motions that are
<
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made upon the round top, depending on the fluctuation of the Ship.</
s
>
</
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<
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type
="
margin
">
<
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>
<
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id
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* I deviate here
<
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from the ſtrict Sea
<
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Diallect, which
<
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denominatesall
<
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ſtances by Leagues.</
s
>
</
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>
<
p
type
="
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">
<
s
>SALV. </
s
>
<
s
>We will ſuppoſe that the Ship goeth towards the Eaſt.
<
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</
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>
<
s
>Firſt, in a calme Sea, it would have no other motion than
<
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/>
<
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n
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this of progreſſion, but adding the undulation of the Waves,
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there ſhall reſult thence one, which alternately hoyſting and
<
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ering the poop and prow, maketh the round top, to lean forwards
<
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and backwards; other waves driving the veſſel ſidewayes, bow the
<
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/>
Maſt to the Starboard and Larboard; others, may bring the ſhip
<
lb
/>
ſomewhat abovt, and bear her away by the Miſne from Eaſt, one
<
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/>
<
arrow.to.target
n
="
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"/>
<
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while towards the ^{*} Northeaſt; another while toward the
<
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eaſt; others bearing her up by the Carine may make her onely to
<
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riſe, and fall; and in ſum, theſe motions are for ſpecies two, one
<
lb
/>
that changeth the direction of the
<
emph
type
="
italics
"/>
Teleſcope
<
emph.end
type
="
italics
"/>
angularly, the other
<
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lineally, without changing angle, that is, alwayes keeping the
<
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tube of the Inſtrument parallel to its ſelf.</
s
>
</
p
>
<
p
type
="
margin
">
<
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>
<
margin.target
id
="
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"/>
<
emph
type
="
italics
"/>
Different
<
lb
/>
ons depending on
<
lb
/>
the fluctuation of
<
lb
/>
the Ship.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg435
"/>
*
<
emph
type
="
italics
"/>
Greco,
<
emph.end
type
="
italics
"/>
which
<
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/>
the Latine
<
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/>
ſlator according to
<
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/>
his uſual
<
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neſſe (to call it no
<
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/>
worſe) tranſlates
<
lb
/>
<
emph
type
="
italics
"/>
Corum Ventum,
<
emph.end
type
="
italics
"/>
<
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/>
the Northweſt
<
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/>
Wind, for
<
emph
type
="
italics
"/>
Ventum
<
lb
/>
Libanotum.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>Tell me, in the next place, if we, having firſt directed
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/>
<
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<
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/>
the
<
emph
type
="
italics
"/>
Teleſcope
<
emph.end
type
="
italics
"/>
yonder away towards the Tower of ^{*}
<
emph
type
="
italics
"/>
Burano,
<
emph.end
type
="
italics
"/>
ſix
<
lb
/>
miles from hence, do turn it angularly to the right hand, or to the
<
lb
/>
left, or elſe upwards or downwards, but a ^{*}ſtraws breadth, what
<
lb
/>
<
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="
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"/>
<
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/>
fect ſhall it have upon us touching the finding out of the ſaid tower?</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg436
"/>
<
emph
type
="
italics
"/>
Two mutations
<
lb
/>
made in the
<
lb
/>
ſcope, depending on
<
lb
/>
the agitation of the
<
lb
/>
Ship.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
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"/>
* This is a Caſtle
<
lb
/>
ſix Italian miles
<
lb
/>
from
<
emph
type
="
italics
"/>
Venice
<
emph.end
type
="
italics
"/>
<
lb
/>
Northwards.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>It would make us immediately loſe ſight of it, for ſuch
<
lb
/>
a declination, though ſmall here, may import there hundreds and
<
lb
/>
<
arrow.to.target
n
="
marg438
"/>
<
lb
/>
thouſands of yards.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg438
"/>
*
<
emph
type
="
italics
"/>
Vnnerod'
<
lb
/>
na,
<
emph.end
type
="
italics
"/>
the black or
<
lb
/>
paring of a nail.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>But if without changing the angle, keeping the tube
<
lb
/>
alwayes parallel to it ſelf, we ſhould transfer it ten or twelve
<
lb
/>
yards farther off to the right or left hand, upwards or downwards,
<
lb
/>
what alteration would it make as to the Tower?</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>The change would be abſolutely undiſcernable; for
<
lb
/>
that the ſpaces here and there being contained between parallel
<
lb
/>
rayes, the mutations made here and there, ought to be equal, and
<
lb
/>
becauſe the ſpace which the Inſtrument diſcovers yonder, is
<
lb
/>
ble of many of thoſe Towers; therefore we ſhall not loſe ſight of it.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SAGR. </
s
>
<
s
>Returning now to the Ship, we may undoubtedly
<
lb
/>
firm, that the
<
emph
type
="
italics
"/>
Teleſcope
<
emph.end
type
="
italics
"/>
moving to the right or left, upwards, or </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>