Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſuppoſing it's Centre at O by which it is ſuſtained to be no more
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but an indiviſible Point, like as I have ſuppoſed here for the Leaver,
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if the Armes be declined one way or the other, that which ſhall be
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the lowermoſt ought evermore to be adjudged the heavier; ſo that
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the Centre of Gravity is not ſixed and immoveable in each ſeveral
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Body, as the Ancients have ſuppoſed, which no perſon, that I
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know of, hath hitherto obſerved.</
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>But theſe laſt Conſiderations are of no moment in Practice, and
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it would be good for thoſe who ſet themſelves to invent new
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Machines, that they knew nothing more of this buſi
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neſſe than this little which I have now writ thereof,
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for then they would not be in danger of decei
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ving themſelves in their Computation,
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as they frequently do in ſuppoſing
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other Principles.</
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FINIS.
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