Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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              and indubitable fundamentals. </s>
              <s>And becauſe, as I ſay, I deſire de­
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              monſtratively to aſſure you, and not with only probable diſcour­
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              ſes to perſwade you; preſuppoſing, that you have ſo much know­
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              ledge of the Mechanical Concluſions, by others heretofore funda­
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              mentally handled, as ſufficeth for our purpoſe; it is requiſite, that
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              before we proceed any further, we conſider what effect that is which
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              opperates in the Fraction of a Beam of Wood, or other Solid, whoſe
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              parts are firmly connected; becauſe this is the firſt
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              Notion,
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              where­
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              on the firſt and ſimple principle dependeth, which as familiarly
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              known, we may take for granted. </s>
              <s>For the clearer explanation
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              whereof; let us take the Cilinder, or Priſme,
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              A. B.
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              of Wood, or
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              other ſolid and coherent matter, faſtned above in
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              A,
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              and hanging
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              perpendicular; to which, at the other end
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              B,
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              let there hang the
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              Weight
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              C
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              : It is manifeſt, that how great ſoever the Tenacity and
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              coherence of the parts of the ſaid Solid to one another be, ſo it be
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              not infinite, it may be overcome by the
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              Force of the drawing Weight C: whoſe
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              Gravity I ſuppoſe may be encreaſed as much
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                <figure id="id.040.01.698.1.jpg" xlink:href="040/01/698/1.jpg" number="52"/>
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              as we pleaſe; by the encreaſe whereof the
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              ſaid Solid in fine ſhall break, like as if it had
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              been a Cord. </s>
              <s>And, as in a Cord, we under­
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              ſtand its reſiſtance to proceed from the mul­
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              titude of the ſtrings or threads in the Hemp
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              that compoſe it, ſo in Wood we ſee its veins,
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              and grain diſtended lengthwaies, that render
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              it far more reſiſting againſt Fraction, then any
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              Rope would be, of the ſame thickneſſe: but
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              in a Cylinder of ſtone or Metal the Tenacity
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              of its parts, (which yet ſeemeth greater) de­
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              pendeth on another kind of Cement,
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              than of ſtrings, or grains, and yet they alſo
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              being drawn with equivalent force, break.</s>
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              By Accademick
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              here, as in his
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              Dialogues of the
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              Syſteme,
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              Galile­
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              us
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              meaneth him­
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              ſelf.
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              Ariſtotle
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              the firſt
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              Obſerver of Me­
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              chanical Concluſi­
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              ons, but they nei­
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              ther not the moſt
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              curious nor ſolidly
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              demonſtrated.
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              <s>SIMP. </s>
              <s>If the thing ſucceed as you ſay, I underſtand well
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              enough, that the thread or grain of the Wood which is as long as
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              the ſaid Wood may make it ſtrong and able to Reſiſt a great vio­
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              lence done to it to break it: But a Cord compoſed of ſtrings of
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              Hemp, no longer than two, or three foot a piece, how can it be ſo
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              ſtrong when it is ſpun out, it may be, to a hundred times that
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              length? </s>
              <s>Now I would farther underſtand your opinion concern­
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              ing the Connection of the parts of Metals, Stones, and other mat­
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              ters deprived of ſuch Ligatures, which nevertheleſſe, if I be not
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              deceived, are yet more tenacious.</s>
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              <s>SALV. </s>
              <s>We muſt be neceſſitated to digreſſe into new Specu­
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              lations, and not much to our purpoſe, if we ſhould reſolve thoſe
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              difficulties you ſtart.</s>
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