Galilei, Galileo
,
The systems of the world
,
1661
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circular which we preſuppoſe natural to the whole Terreſtrial
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Globe, of which the ſtone is a part.</
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Ariſtotle
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teth that the Fire
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moveth directly
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upwards by
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ture, and round
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bout by
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tion.
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>SIMPL. </
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>I ſee no ſuch thing: for if the element of Fire
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volve round together with the Air, it is a very eaſie, yea a neceſſary
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thing, that a ſpark of fire which from the Earth mounts upwards,
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in paſſing thorow the moving air, ſhould receive the ſame motion,
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being a body ſo thin, light, and eaſie to be moved: but that a
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very heavy ſtone, or a Canon bullet, that deſcendeth from on
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high, and that is at liberty to move whither it will, ſhould ſuffer
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it ſelf to be tranſported either by the air or any other thing, is
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altogether incredible. </
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<
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>Beſides that, we have the Experiment,
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which is ſo proper to our purpoſe, of the ſtone let fall from the
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round top of the Maſt of a ſhip, which when the ſhip lyeth ſtill,
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falleth at the Partners of the Maſt; but when the ſhip ſaileth, falls
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ſo far diſtant from that place, by how far the ſhip in the time of
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the ſtones falling had run forward; which will not be a few
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thoms, when the ſhips courſe is ſwift.</
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<
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>SALV. </
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>There is a great diſparity between the caſe of the Ship
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and that of the Earth, if the Terreſtrial Globe be ſuppoſed to have
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a diurnal motion. </
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<
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>For it is a thing very manifeſt, that the
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tion of the Ship, as it is not natural to it, ſo the motion of all thoſe
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things that are in it is accidental, whence it is no wonder that the
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ſtone which was retained in the round top, being left at liberty,
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deſcendeth downwards without any obligation to follow the
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tion of the Ship. </
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<
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>But the diurnal converſion is aſcribed to the
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Terreſtrial Globe for its proper and natural motion, and
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quently, it is ſo to all the parts of the ſaid Globe; and, as being
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impreſs'd by nature, is indelible in them; and therefore that ſtone
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that is on the top of the Tower hath an intrinſick inclination of
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revolving about the Centre of its
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Whole
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in twenty four hours, and
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this ſame natural inſtinct it exerciſeth eternally, be it placed in any
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ſtate whatſoever. </
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<
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>And to be aſſured of the truth of this, you
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have no more to do but to alter an antiquated impreſſion made
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in your mind; and to ſay, Like as in that I hitherto holding it to
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be the property of the Terreſtrial Globe to reſt immoveable about
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its Centre, did never doubt or queſtion but that all whatſoever
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particles thereof do alſo naturally remain in the ſame ſtate of reſt:
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So it is reaſon, in caſe the Terreſtrial Globe did move round by
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natural inſtinct in twenty four hours, that the intrinſick and
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ral inclination of all its parts ſhould alſo be, not to ſtand ſtill, but
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to follow the ſame revolution. </
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<
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>And thus without running into
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any inconvenience, one may conclude, that in regard the motion
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conferred by the force of ^{*}Oars on the Ship, and by it on all the
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things that are contained within her, is not natural but forreign, it
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is very reaſonable that that ſtone, it being ſeparated from the ſhip, </
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