Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſwift, ſhall in that point be exceeding ſlow; But the great
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nitude of the body is that which maketh it of exceeding ſlow, to
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become exceeding ſwift, although it continueth ſtill the ſame, and
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thus the velocity encreaſeth, not beyond the model of the
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ject, but rather according to it, and to its magnitude; very
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ferently from the imagination of
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Kepler.
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A ſixth
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ment againſt
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pernicus,
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taken
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from animals, who
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have need of
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though their
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on be natural.
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An argument
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from
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Kepler
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in
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vour of
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cus.</
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The Author of
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the Anti Tycho
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poſeth
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Kepler.</
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The velocity of
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the circular
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on increaſeth,
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cording to the
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creaſe of the
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meter of the circle.
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<
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>SALV. </
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>I do not believe that this Author hath entertained ſo
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mean and poor a conceit of
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Kepler,
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as to perſwade himſelf that
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he did not underſtand, that the higheſt term of a line drawn from
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the centre unro the Starry Sphere, moveth more ſwiftly than a
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point of the ſame line taken within a yard or two of the centre. </
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<
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>And
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therefore of neceſſity he muſt have conceived and
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ed that the mind and intention of
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Kepler
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was to have ſaid, that
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it is leſſe inconvenient to encreaſe an immoveable body to an
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traordinary magnitude, than to aſcribe an extraordinary velocity
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to a body, though very bigge, having regard to the model,
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that is to the gauge, and to the example of other natural bodies;
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in which we ſee, that the diſtance from the centre encreaſing, the
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velocity diminiſheth; that is, that the periods of their
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ons take up longer times. </
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<
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>But in reſt which is not capable of
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mentation or diminution, the grandure or ſmalneſſe of the body
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maketh no differeuce. </
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<
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>So that if the anſwer of the Author would
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be directed againſt the argument of
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Kepler,
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it is neceſſary, that
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that Author doth hold, that to the movent principle its one and the
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ſame to move in the ſame time a body very ſmall, or very
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menſe, in regard that the augmentation of velocity inſeparably
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attends the augmentation of the maſſe. </
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<
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>But this again is contrary
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to the Architectonical rule of nature, which doth in the leſſer
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Spheres, as we ſee in the Planets, and moſt ſenſibly in the
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cean Stars, obſerve to make the leſſer Orbs to circulate in ſhorter
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times: Whence the time of
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Saturns
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revolution is longer than all
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the times of the other leſſer Spheres, it being thirty years; now
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the paſſing from this to a Sphere very much bigger, and to make
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it move in 24. hours, may very well be ſaid to exceed the rules of
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the model. </
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<
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>So that if we would but attentively conſider it, the
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Authors anſwer oppoſeth not the intent and ſenſe of the argument,
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but the expreſſing and manner of delivering of it; where again
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the Author is injurious, and cannot deny but that he artificially
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diſſembled his underſtanding of the words, that he might charge
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Kepler
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with groſſe ignorance; but the impoſture was ſo very dull
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and obvions, that he could not with all his craft alter the
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on which
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Kepler
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hath begot of his Doctrine in the minds of all
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the Learned. </
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<
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>As in the next place, to the inſtance againſt the
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perpetual motion of the Earth, taken from the impoſſibility of
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its moving long without wearineſſe, in regard that living </
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