Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

Table of figures

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              <s>
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              ther account, there being no place left for doubting of ſo clear, and
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              neceſſary a Conſequence.</s>
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              <s>SAGR. </s>
              <s>You Divine
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              Simplicius,
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              I was thinking if a Million of
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              Gold
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              per annum,
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              coming from
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              Spaine,
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              not being ſufficient to pay
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              the Army, whether it was neceſſary to make any other proviſion
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              than of Money to pay the Souldiers. </s>
              <s>But proceed,
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              Salviatus,
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              and
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              ſuppoſing that I admit of your Conſequence, ſhew us how to ſe­
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              parate the opperation of Vacuity from the other, that meaſuring
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              it we may ſee how it's inſufficient for the Effect of which we ſpeak.</s>
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              <s>SALV. </s>
              <s>Your Genius hath prompted you. </s>
              <s>Well, I will tell you
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              the way to part the Virtue of Vacuity from the reſt, and then how
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              to meaſure it. </s>
              <s>And to ſever it, we will take a continuate matter,
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              whoſe parts are deſtitute of all other Reſiſtance to Separation, ſave
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              only that of Vacuity, ſuch as Water at large hath been demon­
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              ſtrated to be in a certain Tractate of our
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              Accademick.
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              So that
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              when ever a Cylinder of Water is ſo diſpoſed, that being drawn
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              we find a Reſiſtance againſt the ſeparation of its parts, this muſt
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              be acknowledged to proceed from no other cauſe, but from re­
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              pugnance to Vacuity. </s>
              <s>But to make ſuch an experiment, I have
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              imagined a device, which with the help of a ſmall Diagram, may
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              be better expreſt than by my bare words. </s>
              <s>Let this Figure C A B D
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              be the Profile of a Cylinder of Metal, or of Glaſs, which muſt
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              be made hollow within, but turned exactly round; into whoſe
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              Concave muſt enter a Cylinder of Wood, exquiſitely fitted to
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              touch every where, whoſe Profile is noted by
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              E G H F, which Cylinder may be thruſt up­
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              wards, and downwards: and this I would
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              have bored in the middle, ſo that there may
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              a rod of Iron paſs thorow, hooked in the end
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              K, and the other end I, ſhall grow thicker in
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              faſhion of a Cone, or Top; and let the
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              hole made for the ſame thorow the Cylinder
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              of Wood be alſo cut hollow in the upper
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              part, like a Conical Superficies, and exactly
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              fitted to receive the Conick end I, of the
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              Iron I K, as oft as it is drawn down by the
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              part K. </s>
              <s>Then I put the Cylinder of Wood
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              E H into the Concave Cylinder A D, and
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              would not have it come to touch the upper­
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              moſt Superficies of the ſaid hollow Cylinder,
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              but that it ſtay two or three fingers breadth
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              from it: and I would have that ſpace filled with Water; which
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              ſhould be put therein, holding the Veſſel with the mouth C D up­
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              wards; and thereupon preſs down the Stopper E H, holding the
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              Conical part I ſomewhat diſtant from the hollow that was made </s>
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