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

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              check that is immoveable, they ſhall fly out with great
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              ſity: the ſame effect following in that caſe, which we ſee dayly
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              to fall out in a boat that running a ſwift courſe, runs a-ground, or
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              meets with ſome ſudden ſtop, for all thoſe in the boat, being
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              prized, ſtumble forwards, and fall towards the part whither the
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              boat ſteered. </s>
              <s>And in caſe the Earth ſhould meet with ſuch a
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              check, as ſhould be able to reſiſt and arreſt its
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              vertigo,
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              then indeed
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              I do believe that not onely beaſts, buildings and cities, but
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              tains, lakes and ſeas would overturn, and the globe it ſelf would
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              go near to ſhake in pieces; but nothing of all this concerns our
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              preſent purpoſe, for we ſpeak of what may follow to the motion
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              of the Earth, it being turn'd round uniformly, and quietly about
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              its own centre, howbeit with a great velocity. </s>
              <s>That likewiſe
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              which you ſay of the ſlings, is true in part; but was not alledged
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              by
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              Salviatus,
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              as a thing that punctually agreed with the matter
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              whereof we treat, but onely, as an example, for ſo in groſs it may
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              prompt us in the more accurate conſideration of that point,
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              ther, the velocity increaſing at any rate, the cauſe of the
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              ction doth increaſe at the ſame rate: ſo that
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              v. </s>
              <s>g.
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              if a wheel of
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              ten yards diameter, moving in ſuch a manner that a point of its
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              circumference will paſs an hundred yards in a minute of an hour,
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              and ſo hath an
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              impetus
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              able to extrude a ſtone, that ſame
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              impetus
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              ſhall be increaſed an hundred thouſand times in a wheel of a million
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              of yards diameter; the which
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              Salviatus
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              denieth, and I incline to his
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              opinion; but not knowing the reaſon thereof, I have requeſted it
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              of him, and ſtand impatiently expecting it.</s>
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              <s>
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              Graming the
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              urnal
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              vertigo
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              of
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              the Earth, & that
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              by ſome ſudden ſtop
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              or obſtacle it were
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              arreſted, houſes,
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              mountains
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              ſelves, and perhaps
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              the whole Globe
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              would be ſhaken n
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              pieces.
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              </s>
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              <s>SALV. </s>
              <s>I am ready to give you the beſt ſatisfaction, that my
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              abilities will give leave: And though in my firſt diſcourſe you
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              thought that I had enquired into things eſtranged from our
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              poſe, yet nevertheleſſe I believe that in the ſequel of the diſpute,
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              you will find that they do not prove ſo. </s>
              <s>Therefore let
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              Sagredus
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              tell me wherein he hath obſerved that the reſiſtance of any
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              able to motion doth conſiſt.</s>
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              <s>SAGR. </s>
              <s>I ſee not for the preſent that the moveable hath any
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              internal reſiſtance to motion, unleſſe it be its natural inclination
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              and propenſion to the contrary motion, as in grave bodies, that
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              have a propenſion to the motion downwards, the reſiſtance is to
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              the motion upwards; and I ſaid an internal reſiſtance, becauſe
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              of this, I think, it is you intend to ſpeak, and not of the external
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              reſiſtances, which are many and accidental.</s>
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              <s>SALV. </s>
              <s>It is that indeed I mean, and your nimbleneſſe of wit
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              hath been too hard for my craftineſſe, but if I have been too
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              ſhort in asking the queſtion, I doubt whether
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              Sagredus
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              hath been
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              full enough in his anſwer to ſatisſie the demand; and whether
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              there be not in the moveable, beſides the natural inclination to the </s>
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