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

List of thumbnails

< >
231
231 		232
232
233
233 		234
234
235
235 		236
236
237
237 		238
238
239
239 		240
240
< >
page |< < of 701 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/236.jpg" pagenum="218"/>
              differs in ſpecies from a right motion? </s>
              <s>If it be violent, how is it
                <lb/>
              that a fiery dart flying upwards, ſparkling over our heads at a
                <lb/>
              ſtance from the Earth, but not turning about,
                <emph type="italics"/>
              &c.
                <emph.end type="italics"/>
                <lb/>
                <arrow.to.target n="marg420"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg420"/>
                <emph type="italics"/>
              Of the mixt
                <lb/>
              tion we ſee not the
                <lb/>
              part that is
                <lb/>
              lar, becauſe we
                <lb/>
              partake thereof.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>It hath been ſaid already very often, that the circular
                <lb/>
              motion is natural to the whole, and to its parts, whilſt they are in
                <lb/>
              perfect diſpoſure, and the right is to reduce to order the parts
                <lb/>
              diſordered; though indeed it is better to ſay, that neither the
                <lb/>
              parts ordered or diſordered ever move with a right motion, but
                <lb/>
              with one mixed, which might as well be averred meerly circular:
                <lb/>
              but to us but one part onely of this motion is viſible and
                <lb/>
              vable, that is, the part of the right, the other part of the circular
                <lb/>
              being imperceptible to us, becauſe we partake thereof. </s>
              <s>And this
                <lb/>
              anſwers to the rays which move upwards, and round about, but we
                <lb/>
              cannot diſtinguiſh their circular motion, for that, with that we our
                <lb/>
              ſelves move alſo. </s>
              <s>But I believe that this Author never thought
                <lb/>
              of this mixture; for you may ſee that he reſolutely ſaith, that the
                <lb/>
              rays go directly upwards, and not at all in gyration.</s>
            </p>
            <p type="main">
              <s>SIMP.
                <emph type="italics"/>
              Quare centrum ſphære delapſæ ſub Æquatore ſpiram
                <lb/>
              ſcribit in ejus plano: ſub aliis parallelis ſpiram deſcribit in cono?
                <lb/>
              </s>
              <s>ſub Polo deſcendit in axe lineam gyralem, decurrens in ſuperficie
                <lb/>
              cylindricâ conſignatam
                <emph.end type="italics"/>
              ? (In Engliſh to this purpoſe:) Why doth
                <lb/>
              the centre of a falling Globe under the Æquinoctial deſcribe a
                <lb/>
              ſpiral line in the plane of the Æquator; and in other parallels
                <lb/>
              a ſpiral about a Cone; and under the Pole deſcend in the
                <lb/>
              axis deſcribing a gyral line, running in a Cylindrical
                <lb/>
              cies?</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Becauſe of the lines drawn from the Centre to the
                <lb/>
              cumference of the ſphere, which are thoſe by which
                <emph type="italics"/>
              graves
                <emph.end type="italics"/>
                <lb/>
              fcend, that which terminates in the Æquinoctial deſigneth a
                <lb/>
              cle, and thoſe that terminate in other parallels deſcribe conical
                <lb/>
              ſuperficies; now the axis deſcribeth nothing at all, but continueth
                <lb/>
              in its own being. </s>
              <s>And if I may give you my judgment freely, I
                <lb/>
              will ſay, that I cannot draw from all theſe Queries, any ſenſe that
                <lb/>
              interfereth with the motion of the Earth; for if I demand of this
                <lb/>
              Author, (granting him that the Earth doth not move) what would
                <lb/>
              follow in all theſe particulars, ſuppoſing that it do move, as
                <emph type="italics"/>
                <lb/>
              pernicus
                <emph.end type="italics"/>
              will have it; I am very confident, that he would ſay that
                <lb/>
              all theſe effects would happen, that he hath objected, as
                <lb/>
              niences to diſprove its mobility: ſo that in this mans opinion
                <lb/>
              ceſſary conſequences are accounted abſurdities: but I beſeech
                <lb/>
              you, if there be any more, diſpatch them, and free us ſpeedily
                <lb/>
              from this weariſom task.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>In this which follows he oppoſes
                <emph type="italics"/>
              Copernicus
                <emph.end type="italics"/>
              & his Sectators,
                <lb/>
              who affirm, that the motion of the parts ſeparated from their whole,
                <lb/>
              is onely to unite themſelves to their whole; but that the moving </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum