Galilei, Galileo
,
The systems of the world
,
1661
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therefore if that ſtone let fall from the round top, ought to
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low the motion of the ſhip, that effect ſhould be aſcribed to the
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Air, and not to the vertue impreſſed. </
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<
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>But you preſuppoſe that
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the Air doth not follow the motion of the ſhip, but is tranquil.
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<
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>Moreover, he that letteth it fall, is not to throw it, or to give
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it
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impetus
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with his arm, but ought barely to open his hand and let
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it go; and by this means, the ſtone, neither through the vertue
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impreſſed by the projicient, nor through the help of the Air,
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ſhall be able to follow the ſhips motion, and therefore ſhall be
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left behind.</
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The project
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cording to
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tle,
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is not moved by
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vertue impreſſed,
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but by the
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medium.</
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<
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>SALV. </
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<
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>I think then that you would ſay, that if the ſtone be
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not thrown by the arm of that perſon, it is no longer a
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jection.</
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<
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>SIMPL. </
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>It cannot be properly called a motion of projection.</
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<
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>SALV. </
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<
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>So then that which
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Ariſtotle
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ſpeaks of the motion, the
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moveable, and the mover of the projects, hath nothing to do
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with the buſineſſe in hand; and if it concern not our purpoſe,
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why do you alledg the ſame?</
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>SIMP. </
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<
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>I produce it on the oceaſion of that impreſſed vertue,
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named and introduced by you, which having no being in the
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World, can be of no force; for
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non-entium nullæ ſunt
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nes
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; and therefore not onely of projected, but of all other
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ternatural motions, the moving cauſe ought to be aſcribed to the
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medium,
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of which there hath been no due conſideration had;
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and therefore all that hath been ſaid hitherto is to no purpoſe.</
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<
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>SALV. </
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<
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>Go to now, in good time. </
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<
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>But tell me, ſeeing that
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your inſtance is wholly grounded upon the nullity of the vertue
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impreſſed, if I ſhall demonſtrate to you, that the
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medium
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hath
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nothing to do in the continuation of projects, after they are
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patated from the projicient, will you admit of the impreſſed
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tue, or will you make another attempt to overthrow it?</
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<
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>SIMP. </
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<
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>The operation of the
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medium
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being removed, I ſee not
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how one can have recourſe to any thing elſe ſave the faculty
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preſſed by the mover.</
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<
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>SALV. </
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<
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>It would be well, for the removing, as much as is
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poſſible, the occaſions of multiplying contentions, that you
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would explain with as much diſtinctneſſe as may be, what is that
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operation of the
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medium
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in continuing the motion of the
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Operation of the
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medium
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in
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ing the motion of
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the project.
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<
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>SIMP. </
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<
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>The projicient hath the ſtone in his hand, and with
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force and violence throws his arm, with which jactation the
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ſtone doth not move ſo much as the circumambient Air; ſo that
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when the ſtone at its being forſaken by the hand, findeth it ſelf
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in the Air, which at the ſame time moveth with impetouſity, it
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is thereby born away; for, if the air did not operate, the ſtone
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would fall at the foot of the projicient or thrower.</
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