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

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            <pb xlink:href="040/01/699.jpg" pagenum="7"/>
            <p type="main">
              <s>SAGR. </s>
              <s>But if Digreſſions may lead us to the knowledge of
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              new Truths, what prejudice is it to us, that are not obliged to a
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              ſtrict and conciſe method, but that make our Congreſſions only
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              for our divertiſement to digreſſe ſometimes, leſt we let ſlip thoſe
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              Notions, which perhaps the offered occaſion being paſt, may never
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              meet with another opportunity of remembrance? </s>
              <s>Nay, who knows
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              not, that many times curioſity may thereby diſcover hints of more
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              worth, than the primarily intended Concluſions? </s>
              <s>Therefore I
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              entreat you to give ſatisfaction to
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              Simplicius,
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              and my ſelf alſo,
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              no leſſe curious than he, and deſirous to underſtand what that
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              Cement is, that holdeth the parts of thoſe Solids ſo tenaciouſly
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              conjoyned, which yet nevertheleſſe in concluſion are diſſoluble:
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              a knowledge which furthermore is neceſſary for the underſtanding
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              of the coherence of the parts of thoſe very ligaments, whereof
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              ſome Solids are compoſed.</s>
            </p>
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              <s>SALV. Well, ſince it is your pleaſure, I will herein ſerve you.
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                <arrow.to.target n="marg999"/>
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              And the firſt difficulty is, how the threads of a Cord or Rope
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              an hundred foot long ſhould ſo cloſely connect together (none
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              of them exceeding two or three foot) that it requireth a great
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              violence to break them. </s>
              <s>But tell me,
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              Simplicius,
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              cannot you hold
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              one ſingle ſtring of Hemp ſo faſt between your fingers by one
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                <arrow.to.target n="marg1000"/>
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              end, that I pulling by the other end ſhould break it ſooner than
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              get it from you? </s>
              <s>Queſtionleſſe you might: when then, thoſe
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              threads are not only at the end, but alſo in every part of their
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              length, held faſt with much ſtrength by him that graſpeth them, is
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              it not apparent, that it is a much harder matter to pluck them
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              from him that holds them, then to break them? </s>
              <s>Now in the Cord,
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                <arrow.to.target n="marg1001"/>
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              the ſame act of twiſting, binds the threads mutually within one
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              another, in ſuch ſort, that pulling the Cord with great force, the
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              threads of it break inſunder, but ſeparate and part not from one
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              another; as is plainly ſeen by viewing the ſhort ends of the ſaid
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              threads in the broken place, that are not a ſpan long; as they
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              would be, if the diviſion of the Cord had been made by the ſole
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              ſeperating of them in drawing the Cord, and not by breaking
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              them.</s>
            </p>
            <p type="margin">
              <s>
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                <emph type="italics"/>
              What that Cement
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              is that Connecteth
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              the parts of Solids.
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              </s>
            </p>
            <p type="margin">
              <s>
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                <emph type="italics"/>
              How a Rope or
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              Cord reſiſteth Fra­
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              ction.
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              </s>
            </p>
            <p type="margin">
              <s>
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                <emph type="italics"/>
              In breaking a Rope
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              the parts are not
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              ſeparated, but bro­
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              kon.
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              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>For confirmation of this, let me add, that the Cord is
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              ſometimes ſeen to break, not by pulling it length-waies, but by
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              over-twiſting it: an argument, in my judgment, concluding that
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              the threads are ſo enterchangeably compreſt by one another, that
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              thoſe compreſſings permit not the compreſſed to ſlip ſo very little,
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              as is requiſite to lengthen it out that it wind about the Cord,
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              which in the twining breaketh, and conſequently in ſome ſinall
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              meaſure ſwels in thickneſſe.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>You ſay very well; but conſider by the way, how one
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              truth draweth on another. </s>
              <s>That thread, which griped between the </s>
            </p>
          </chap>
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