Galilei, Galileo
,
The systems of the world
,
1661
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<
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>SIMP. </
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<
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>The top will run reeling along the floor towards that
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part whither its upper parts encline it.</
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<
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>SAGR. </
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<
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>And why not whither the contrary parts tend, namely,
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thoſe which touch the ground?</
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</
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<
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>SIMP. </
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<
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>Becauſe thoſe upon the ground happen to be impeded
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by the roughneſs of the touch, that is, by the floors unevenneſs;
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but the ſuperiour, which are in the tenuous and flexible air, are
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hindred very little, if at all; and therefore the top will obey their
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inclination.</
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</
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<
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<
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>SAGR. </
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<
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>So that that taction, if I may ſo ſay, of the neither
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parts on the floor, is the cauſe that they ſtay, and onely the upper
<
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parts ſpring the top forward.</
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<
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>SALV. </
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<
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>And therefore, if the top ſhould fall upon the ice, or
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other very ſmooth ſuperficies, it would not ſo well run forward, but
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might peradventure continue to revolve in it ſelf, (or ſleep)
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out acquiring any progreſſive motion.</
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>
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<
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<
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>SAGR. </
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>
<
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>It is an eaſie thing for it ſo to do; but yet
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leſs, it would not ſo ſpeedily come to ſleep, as when it falleth on
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a ſuperficies ſomewhat rugged. </
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<
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>But tell me,
<
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Simplicius,
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when
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the top turning round about it ſelf, in that manner, is let fall, why
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doth it not move forwards in the air, as it doth afterwards when it
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is upon the ground?</
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>
</
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<
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<
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>SIMP. </
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>
<
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>Becauſe having air above it, and beneath, neither thoſe
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parts, nor theſe have any where to touch, and not having more
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caſion to go forward than backward, it falls perpendicularly.</
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>
</
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<
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<
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>SAGR. </
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>
<
s
>So then the onely reeling about its ſelf, without other
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<
emph
type
="
italics
"/>
impetus,
<
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can drive the top forward, being arrived at the ground,
<
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very nimbly. </
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>
<
s
>Now proceed we to what remains. </
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>
<
s
>That laſh,
<
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which the driver tyeth to his Top-ſtick, and with which, winding
<
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it about the top, he ſets it (
<
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type
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i. </
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>
<
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>e.
<
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type
="
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"/>
makes it go) what effect hath it on
<
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the ſaid top?</
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>
</
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>
<
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type
="
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">
<
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>SIMP. </
s
>
<
s
>It conſtrains it to turn round upon its toe, that ſo it may
<
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/>
free it ſelf from the Top-laſh.</
s
>
</
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>
<
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type
="
main
">
<
s
>SAGR. </
s
>
<
s
>So then, when the top arriveth at the ground, it cometh
<
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all the way turning about its ſelf, by means of the laſh. </
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>
<
s
>Hath it
<
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not reaſon then to move in it ſelf more ſwiftly upon the ground,
<
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than it did whilſt it was in the air?</
s
>
</
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>
<
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type
="
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">
<
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>SIMP. </
s
>
<
s
>Yes doubtleſs; for in the air it had no other impulſe
<
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than that of the arm of the projicient; and if it had alſo the
<
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ing, this (as hath been ſaid) in the air drives it not forward at all:
<
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but arriving at the floor, to the motion of the arm is added the
<
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progreſſion of the reeling, whereby the velocity is redoubled. </
s
>
<
s
>And
<
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/>
I know already very well, that the top skipping from the ground,
<
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its velocity will deminiſh, becauſe the help of its circulation is
<
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/>
wanting; and returning to the Earth will get it again, and by that </
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>
</
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>
</
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>
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</
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>
</
archimedes
>