Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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is its motion. </
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<
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>Having confirmed theſe motions, he proceeds ſaying,
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that of natural bodies ſome being ſimple, and ſome compoſed of
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them (and he calleth ſimple bodies thoſe, that have a principle
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of motion from nature, as the Fire and Earth) it follows that
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ſimple motions belong to ſimple bodies, and mixt to the
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pound; yet in ſuch ſort, that the compounded incline to the part
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predominant in the compoſition.</
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Local motion of
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three kinds, right,
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circular, & mixt.
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Circular, and
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ſtreight motions
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are ſimple, as
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ceeding by ſimple
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lines.
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Ad medium, à
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dio, & circa
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um.
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<
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>SAGR. </
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<
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>Pray you hold a little
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Salviatus,
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for I find ſo many
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doubts to ſpring up on all ſides in this diſcourſe, that I ſhall be
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conſtrained, either to communicate them if I would attentively
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hearken to what you ſhall add, or to take off my attention from
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the things ſpoken, if I would remember objections.</
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<
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>SALV. </
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>I will very willingly ſtay, for that I alſo run the ſame
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hazard, and am ready at every ſtep to loſe my ſelf whilſt I ſail
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tween Rocks, and boiſterous Waves, that make me, as they ſay, to
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loſe my
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Compaſs
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; therefore before I make them more, propound
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your
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The definition of
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Nature, either
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perfect, or
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nable, produced by
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Ariſtotle.</
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>SAGR. </
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<
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>You and
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Ariſtotle
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together would at firſt take me a
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little out of the ſenſible World, to tell me of the
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Architecture,
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wherewith it ought to be fabricated; and very appoſitly begin to
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tell me, that a natural body is by nature moveable, nature being
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(as elſewhere it is defined) the principle of motion. </
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<
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>But here I
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am ſomewhat doubtfull why
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Ariſtotle
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ſaid not that of natural
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dies, ſome are moveable by nature, and others immoveable, for
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that in the definition, nature is ſaid to be the principle of Motion,
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and Reſt; for if natural bodies have all a principle of motion,
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either he might have omitted the mention of Reſt, in the
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on of nature: or not have introduced ſuch a definition in this place.
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>Next, as to the declaration of what
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Ariſtotle
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intends by ſimple
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motions, and how by Spaces he determines them, calling thoſe
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ple, that are made by ſimple lines, which are onely the right, and </
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circular, I entertain it willingly; nor do I deſire to tenter the
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inſtance of the Helix, about the Cylinder; which in that it is in
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very part like to it ſelf, might ſeemingly be numbred among
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ple lines. </
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<
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>But herein I cannot concurre, that he ſhould ſo
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ſtrain ſimple motions (whilſt he ſeems to go about to repeat the
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ſame definition in other words) as to call one of them the motion
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about the
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medium,
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the others
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Surſum & Deorſum,
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namely
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wards and downward; which terms are not to be uſed, out of the
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World fabricated, but imply it not onely made, but already
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habited by us; for if the right motion be ſimple, by the ſimplicity
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of the right line, and if the ſimple motion be natural, it is made on
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every ſide, to wit, upwards, downwards, backwards, forwards, to
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the right, to the left, and if any other way can be imagined,
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vided it be ſtraight, it ſhall agree to any ſimple natural body; or </
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