Galilei, Galileo
,
The systems of the world
,
1661
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hard, as ſuppoſe of braſs; what think you it would do being let
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go? </
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<
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>do not you believe (as for my part I do) that it would lie
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ſtill?</
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<
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>SIMPL. </
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<
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>If that ſuperficies were inclining?</
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<
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>SALV. Yes; for ſo I have already ſuppoſed.</
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<
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>SIMPL. </
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<
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>I cannot conceive how it ſhould lie ſtill: nay, I am
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confident that it would move towards the declivity with much
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penſneſs.</
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<
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>SALV. </
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<
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>Take good heed what you ſay,
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Simplicius,
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for I am
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confident that it would lie ſtill in what ever place you ſhould lay
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it.</
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<
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>SIMPL. </
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<
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>So long as you make uſe of ſuch ſuppoſitions,
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viatus,
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I ſhall ceaſe to wonder if you inferr moſt abſurd
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cluſions.</
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<
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>SALV. </
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<
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>Are you aſſured, then, that it would freely move
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wards the declivity?</
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<
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>SIMPL. </
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<
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>Who doubts it?</
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<
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>SALV. </
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<
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>And this you verily believe, not becauſe I told you ſo,
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(for I endeavoured to perſwade you to think the contrary) but of
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your ſelf, and upon your natural judgment.</
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<
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>SIMPL. </
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<
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>Now I ſee what you would be at; you ſpoke not this
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as really believing the ſame; but to try me, and to wreſt matter
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out of my own mouth wherewith to condemn me.</
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<
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>SALV. </
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<
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>You are in the right. </
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<
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>And how long would that Ball
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move, and with what velocity? </
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<
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>But take notice that I inſtanced
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in a Ball exactly round, and a plain exquiſitely poliſhed, that all
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external and accidental impediments might be taken away. </
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<
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>And
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ſo would I have you remove all obſtructions cauſed by the Airs
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ſiſtance to diviſion, and all other caſual obſtacles, if any other
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there can be.</
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<
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>SIMPL. </
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<
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>I very well underſtand your meaning, and as to your
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demand, I anſwer, that the Ball would continue to move
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in
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finitum,
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if the inclination of the plain ſhould ſo long laſt, and
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tinually with an accelerating motion; for ſuch is the nature of
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ponderous moveables, that
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vires acquirant eundo
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: and the
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er the declivity was, the greater the velocity would be.</
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<
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<
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>SALV. </
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>
<
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>But if one ſhould require that that Ball ſhould move
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upwards on that ſame ſuperficies, do you believe that it would
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ſo do?</
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>
</
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<
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<
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>SIMPL. </
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>
<
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>Not ſpontaneouſly; but being drawn, or violently
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thrown, it may.</
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<
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<
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>SALV. </
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>
<
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>And in caſe it were thruſt forward by the impreſſion of
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ſome violent
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"/>
impetus
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"/>
from without, what and how great would
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its motion be?</
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>
</
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<
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<
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>SIMPL. </
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>
<
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>The motion would go continually decreaſing and </
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>
</
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</
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</
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