Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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been partaker, as part of the ſhip, at the time that it was upon
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the Maſt; the other is the new motion of deſcent, which alſo
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muſt needs be an hinderance of that other progreſſive motion.</
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<
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>SALV. </
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<
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>As to the impediment of the Air, I do not deny it
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you; and if the thing falling were a light matter, as a feather,
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or a lock of wool, the retardation would be very great, but in
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an heavy ſtone is very exceeding ſmall. </
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<
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>And you your ſelf but
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even now did ſay, that the force of the moſt impetuous wind
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ſufficeth not to ſtir a great ſtone from its place; now do but
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ſider what the calmer air is able to do, being encountred by a
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ſtone no more ſwift than the whole ſhip. </
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<
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>Nevertheleſſe, as I ſaid
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before, I do allow you this ſmall effect, that may depend upon
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ſuch an impediment; like as I know, that you will grant to me,
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that if the air ſhould move with the ſame velocity that the ſhip
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and ſtone hath, then the impediment would be nothing at all.
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<
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>As to the other of the additional motion downwards; in the firſt
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place it is manifeſt, that theſe two, I mean the circular, about
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the centre, and the ſtreight, towards the centre, are not
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ries, or deſtructive to one another, or incompatible. </
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<
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>Becauſe that
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as to the moveable, it hath no repugnance at all to ſuch motions,
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for you your ſelf have already confeſt the repugnance to be
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gainſt the motion which removeth from the centre, and the
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nation to be towards the motion which approacheth to the centre.
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<
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>Whence it doth of neceſſity follow, that the moveable hath
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ther repugnance, nor propenſion to the motion which neither
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proacheth, nor goeth from the centre, nor conſequently is there
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any cauſe for the diminiſhing in it the faculty impreſſed. </
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<
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>And
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aſmuch as the moving cauſe is not one alone, which it hath
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tained by the new operation of retardation; but that they are
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two, diſtinct from each other, of which, the gravity attends
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ly to the drawing of the moveable towards the centre, and the
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vertue impreſs't to the conducting it about the centre, there
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maineth no occaſion of impediment.</
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<
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>SIMPL. </
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>Your argumentation, to give you your due, is very
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probable; but in reality it is invelloped with certain intricacies,
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that are not eaſie to be extricated. </
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<
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>You have all along built upon
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a ſuppoſition, which the
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Peripatetick
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Schools will not eaſily grant
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you, as being directly contrary to
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Aristotle,
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and it is to take for
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known and manifeſt, That the project ſeparated from the
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cient, continueth the motion by
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vertue impreſſed
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on it by the
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ſaid projicient, which
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vertue impreſſed
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is a thing as much
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ſted in
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Peripatetick
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Philoſophy, as the paſſage of any accident
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from one ſubject into another. </
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<
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>Which doctrine doth hold, as I
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believe it is well known unto you, that the project is carried by
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the
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medium,
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which in our caſe happeneth to be the Air. </
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<
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>And </
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