Galilei, Galileo
,
The systems of the world
,
1661
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Many
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ments, and
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ſons againſt the
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cauſe of the
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on of projects,
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ſigned by
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Ariſtotle.</
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<
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>SALV. </
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<
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>And was you ſo credulous, as to ſuffer your ſelf to be
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perſwaded to believe theſe fopperies, ſo long as you had your
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ſenſes about you to confute them, and to underſtand the
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truth thereof? </
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<
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>Therefore tell me, that great ſtone, and that
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Canon bullet, which but onely laid upon a table, did continue
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immoveable againſt the moſt impetuous winds, according as you a
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little before did affirm, if it had been a ball of cork or other light
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ſtuffe, think you that the wind would have removed it from its
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place?</
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>SIMP. Yes, and I am aſſured that it would have blown it
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quite away, and with ſo much more velocity, by how much the
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matter was lighter, for upon this reaſon we ſee the clouds to be
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tranſported with a velocity equal to that of the wind that drives
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them.</
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<
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>SALV. </
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<
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>And what is the Wind?</
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<
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>SIMP. </
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>The Wind is defined to be nothing elſe but air moved.</
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<
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>SALV. </
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<
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>Then the moved air doth carry light things more
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ſwiftly, and to a greater diſtance, then it doth heavy.</
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>SIMP. </
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<
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>Yes certainly.</
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<
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>SALV. </
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<
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>But if you were to throw with your arm a ſtone, and a
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lock of cotton wool, which would move ſwiſteſt and fartheſt?</
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<
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>SIMP. </
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<
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>The ſtone by much; nay the wool would fall at my
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feet.</
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<
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>SALV. But, if that which moveth the projected ſubſtance,
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ter it is delivered from the hand, be no other than the air moved
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by the arm, and the moved air do more eaſily bear away light
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than grave matters, how cometh it that the project of wool flieth
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not farther, and ſwifter than that of ſtone? </
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<
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>Certainly it
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eth that the ſtone hath ſome other impulſe beſides the motion of
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the air. </
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<
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>Furthermore, if two ſtrings of equal length did hang
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at yonder beam, and at the end of one there was faſtened a
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let of lead, and a ball of cotton wool at the other, and both
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were carried to an equal diſtance from the perpendicular, and
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then let go; it is not to be doubted, but that both the one and
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the other would move towards the perpendicular, and that being
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carried by their own
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impetus,
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they would go a certain ſpace
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yond it, and afterwards return thither again. </
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<
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>But which of theſe
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two pendent Globes do you think, would continue longeſt in
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tion, before that it would come to reſt in its perpendicularity?</
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<
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>SIMP. </
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<
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>The ball of lead would ſwing to and again many times,
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and that of wool but two or three at the moſt.</
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<
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>SALV. </
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<
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>So that that
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impetus
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and that
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mobility
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whatſoever is
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the cauſe thereof, would conſerve its ſelf longer in grave
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ſtances, than light; I proceed now to another particular, and
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mand of you, why the air doth not carry away that Lemon
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which is upon that ſame Table?</
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