Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>Now if we apply this, that hath been demonſtrated, to our
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purpoſe; preſuppoſing that that ſame Cylinder of Silver, that was
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gilded whilſt it was no more than half a yard long, and four or five
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Inches thick, being diſgroſſed to the ſineneſs of an hair, is prolon
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ged unto the extenſion of twenty thouſand yards (for its length
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would be much greater) we ſhall find its Superficies augmented
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to two hundred times its former greatneſs: and conſequently, thoſe
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Leaves of Gold, which were laid on ten in number, being diſten
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ded on a Superficies two hundred times bigger, aſſure us that the
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Gold which covereth the Superficies of the ſo many yards of Wyer
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is left of no greater thickneſs than the twentieth part of a Leaf of
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ordinary Beaten-Gold. </
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<
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>Conſider, now, how great its thinneſs is, and
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whether it is poſſible to imagine it done without an immenſe di
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ſtention of its parts: and whether this ſeem to you an Experi
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ment, that tendeth likewiſe towards a compoſition of infinite In
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diviſibles in Phyſical Matters: Howbeit there want not other more
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ſtrong and neceſſary proofs of the ſame.</
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<
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>SAGR. </
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<
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>The Demonſtration ſeemeth to me ſo ingenuous, that
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although it ſhould not be of force enough to prove that firſt intent
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for which it was produced, (and yet, in my opinion, it plainly
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makes it out) yet nevertheleſs that ſhort ſpace of time was well
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ſpent which hath been employed in hearing of it.</
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<
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>SALV. </
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<
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>In regard I ſee, that you are ſo well pleaſed with theſe
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Geometrical Demonſtrations, which bring with them certain pro.
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</
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<
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>fit, I will give you the fellow to this, which ſatisfieth to a very cu
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rious Queſtion. </
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<
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>In the former we have that which hapneth in
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Cylinders that are equall, but of different heights or lengths: it
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will be convenient, that you alſo hear that which occurreth in Cy
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linders equal in Superficies, but unequal in heights; my meaning
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alwaies is, in thoſe Superficies only that encompaſs them about,
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that is, not comprehending the two Baſes ſuperiour and inferiour.
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</
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<
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>I ſay, therefore, that</
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<
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>PROPOSITION.</
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Upon Cylinders, the Superficies of which the Baſes be
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ing ſubſtracted are equal, have the ſame proportion
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to one another as their heights Reciprocally taken.
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</
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<
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>Let the Superficies of the two Cylinders A E and C F be
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equall; but the height of this C D greater than the height
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of the other A B. </
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<
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>I ſay, that the Cylinder A E hath the
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ſame proportion to the Cylinder C F, that the height C D hath
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to A B. </
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<
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>Becauſe therefore the Superficies C F is equall to the </
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