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

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              contrary term, another intrinſick and natural quality, which
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              keth it averſe to motion. </s>
              <s>Therefore tell me again; do you not
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              think that the inclination
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              v. </s>
              <s>g.
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              of grave bodies to move
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              wards, is equal to the reſiſtance of the ſame to the motion of
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              jection upwards?</s>
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              <s>
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              The inclination of
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              grave bodies to the
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              motion downwards,
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              is equal to their
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              reſiſtance to the
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              motion upwards.
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              <s>SAGR. </s>
              <s>I believe that it is exactly the ſame. </s>
              <s>And for this reaſon
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              I ſee that two equal weights being put into a ballance, they do
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              ſtand ſtill in
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              equilibrium,
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              the gravity of the one reſiſting its
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              ing raiſed by the gravity wherewith the other preſſing
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              wards would raiſe it.</s>
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              <s>SALV. </s>
              <s>Very well; ſo that if you would have one raiſe up the
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              other, you muſt encreaſe the weight of that which depreſſeth,
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              or leſſen the weight of the other. </s>
              <s>But if the reſiſtance to
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              ing motion cunſiſt onely in gravity, how cometh it to paſſe, that
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              in ballances of unequal arms, to wit in the ^{*}
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              Stiliard,
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              a weight
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              ſometimes of an hundred pounds, with its preſſion downwards,
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              doth not ſuffice to raiſe up on of four pounds; that ſhall
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              poiſe with it, nay this of four, deſcending ſhall raiſe up that
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              of an hundred; for ſuch is the effect of the pendant weight upon
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              the weight which we would weigh? </s>
              <s>If the reſiſtance to motion
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              reſideth onely in the gravity, how can the arm with its weight of
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              four pounds onely, reſiſt the weight of a ſack of wool, or bale of
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              ſilk, which ſhall be eight hundred, or a thouſand weight; yea
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              more, how can it overcome the ſack with its moment, and raiſe
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              it up? </s>
              <s>It muſt therefore be confeſt
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              Sagredus,
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              that here it maketh
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              uſe of ſome other reſiſtance, and other force, beſides that of
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              ſimple gravity.</s>
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              * A portable
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              lance wherewith
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              market-people
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              weigh their
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              modities, giving it
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              gravity by
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              ving the weight
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              farther from the
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              cock: call'd by the
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              Latines,
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              Campana
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              trutina.
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              <s>SAGR. </s>
              <s>It muſt needs be ſo; therefore tell me what this
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              cond virtue ſhould be.</s>
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              <s>SALV. </s>
              <s>It is that which was not in the ballance of equal
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              arms; you ſee then what variety there is in the Stiliard; and
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              on this doubtleſſe dependeth the cauſe of the new effect.</s>
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              <s>SAGR. </s>
              <s>I think that your putting me to it a ſecond time, hath
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              made me remember ſomething that may be to the purpoſe. </s>
              <s>In
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              both theſe beams the buſineſs is done by the weight, and by the
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              motion; in the ballance, the motions are equal, and therefore the
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              one weight muſt exceed it in gravity before it can move it; in the
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              ſtiliard, the leſſer weight will not move the greater, unleſs when
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              this latter moveth little, as being ſlung at a leſſer diſtance, and the
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              other much, as hanging at a greater diſtance from the lacquet or
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              cock. </s>
              <s>It is neceſſary therefore to conclude, that the leſſer weight
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              overcometh the reſiſtance of the greater, by moving much, whilſt
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              the other is moved but little.</s>
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              <s>SALV. </s>
              <s>Which is as much as to ſay, that the velocity of the
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              moveable leſs grave, compenſateth the gravity of the moveable
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              more grave and leſs </s>
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