Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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he likewiſe granteth to mixt bodies compound motions by -----</
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<
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>SAGR. </
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<
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>Stay a little,
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Simplicius,
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& anſwer me to the queſtions
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I ſhall ask you. </
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<
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>You ſay that the Load-ſtone is no ſimple body,
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now I defire you to tell me what thoſe ſimple bodies are, that
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mingle in compoſing the Load-ſtone.</
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Ariſtole
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grants
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a compound motion
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to mixt bodies.
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<
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>SIMP. </
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>I know not how to tell you th'ingredients nor ſimples
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preciſely, but it ſufficeth that they are things elementary.</
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<
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>So much ſufficeth me alſo. </
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>And of theſe ſimple
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mentary bodies, what are the natural motions?</
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>SIMP. </
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<
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>They are the two right and ſimple motions,
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ſurſum
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and
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deorſum.
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>SAGR. </
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<
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>Tell me in the next place? </
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<
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>Do you believe that the
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motion, that ſhall remain natural to that ſame mixed body, ſhould
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be one that may reſult from the compoſition of the two ſimple
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natural motions of the ſimple bodies compounding, or that it
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may be a motion impoſſible to be compoſed of
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The motion of
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mixt bodies ought
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to be ſuch as may
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reſult from the
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compoſition of the
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motions of the
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ple bodies
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pounding.
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<
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>SIMP. </
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<
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>I believe that it ſhall move with the motion reſulting
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from the compoſition of the motions of the ſimple bodies
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pounding, and that with a motion impoſſible to be compoſed of
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theſe, it is impoſſible that it ſhould move.</
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>SAGR. But,
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Simplicius,
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with two right and ſimple motions, you
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ſhall never be able to compoſe a circular motion, ſuch as are the </
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two, or three circular motions that the magnet hath: you ſee
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then into what abſurdities evil grounded Principles, or, to ſay
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better, the ill-inferred conſequences of good Principles carry a
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man; for you are now forced to ſay, that the Magnet is a
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ture compounded of ſubſtances elementary and cœleſtial, if you
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will maintain that the ſtraight motion is a peculiar to the
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ments, and the circular to the cœleſtial bodies. </
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<
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>Therefore if
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you will more ſafely argue, you muſt ſay, that of the integral
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bodies of the Univerſe, thoſe that are by nature moveable, do all
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move circularly, and that therefore the Magnet, as a part of the
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true primary, and integral ſubſtance of our Globe, pertaketh of
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the ſame qualities with it. </
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<
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>And take notice of this your fallacy,
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in calling the Magnet a mixt body, and the Terreſtrial Globe a
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ſimple body, which is ſenſibly perceived to be a thouſand times
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more compound: for, beſides that it containeth an hundred an
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hundred matters, exceeding different from one another, it
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taineth great abundance of this which you call mixt, I mean
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of the Load-ſtone. </
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<
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>This ſeems to me juſt as if one ſhould call
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bread a mixt body, and ^{*}
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Pannada
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a ſimple body, in which there
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is put no ſmall quantity of bread, beſides many other things
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ble. </
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<
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>This ſeemeth to me a very admirable thing, amongſt others </
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