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

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            <pb xlink:href="040/01/244.jpg" pagenum="226"/>
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              <s>SAGR. </s>
              <s>I may then, it ſeems, for once prove a Maſter to you both.
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              </s>
              <s>And becauſe the proceeding by interrogatories doth in my opinion
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              much dilucidate things, beſides the pleaſure which it affords of
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              founding our companion, forcing from him that which he thought he
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              knew not, I will make uſe of that artifice. </s>
              <s>And firſt, I ſuppoſe that the
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              Ship, Gally, or other Veſſel, which we would diſcover, is a great way
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              off, that is, four, ſix, ten, or twenty ^{*} miles, for that to kenne thoſe
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                <arrow.to.target n="marg433"/>
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              neer at hand there is no need of theſe Glaſſes: & conſequently, the
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                <emph type="italics"/>
              Teleſcope
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              may at ſuch a diſtance of four or ſix miles conveniently
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              diſcover the whole Veſſel, & a muchgreater bulk. </s>
              <s>Now I demand
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              what for ſpecies, & how many for number are the motions that are
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              made upon the round top, depending on the fluctuation of the Ship.</s>
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            <p type="margin">
              <s>
                <margin.target id="marg433"/>
              * I deviate here
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              from the ſtrict Sea
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              Diallect, which
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              denominatesall
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              ſtances by Leagues.</s>
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              <s>SALV. </s>
              <s>We will ſuppoſe that the Ship goeth towards the Eaſt.
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              </s>
              <s>Firſt, in a calme Sea, it would have no other motion than
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                <arrow.to.target n="marg434"/>
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              this of progreſſion, but adding the undulation of the Waves,
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              there ſhall reſult thence one, which alternately hoyſting and
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              ering the poop and prow, maketh the round top, to lean forwards
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              and backwards; other waves driving the veſſel ſidewayes, bow the
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              Maſt to the Starboard and Larboard; others, may bring the ſhip
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              ſomewhat abovt, and bear her away by the Miſne from Eaſt, one
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                <arrow.to.target n="marg435"/>
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              while towards the ^{*} Northeaſt; another while toward the
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              eaſt; others bearing her up by the Carine may make her onely to
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              riſe, and fall; and in ſum, theſe motions are for ſpecies two, one
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              that changeth the direction of the
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              Teleſcope
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              angularly, the other
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              lineally, without changing angle, that is, alwayes keeping the
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              tube of the Inſtrument parallel to its ſelf.</s>
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            <p type="margin">
              <s>
                <margin.target id="marg434"/>
                <emph type="italics"/>
              Different
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              ons depending on
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              the fluctuation of
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              the Ship.
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              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg435"/>
              *
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              Greco,
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              which
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              the Latine
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              ſlator according to
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              his uſual
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              neſſe (to call it no
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              worſe) tranſlates
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                <emph type="italics"/>
              Corum Ventum,
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              the Northweſt
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              Wind, for
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              Ventum
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              Libanotum.
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              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>Tell me, in the next place, if we, having firſt directed
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                <arrow.to.target n="marg436"/>
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              the
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              Teleſcope
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              yonder away towards the Tower of ^{*}
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              Burano,
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              ſix
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              miles from hence, do turn it angularly to the right hand, or to the
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              left, or elſe upwards or downwards, but a ^{*}ſtraws breadth, what
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                <arrow.to.target n="marg437"/>
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              fect ſhall it have upon us touching the finding out of the ſaid tower?</s>
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            <p type="margin">
              <s>
                <margin.target id="marg436"/>
                <emph type="italics"/>
              Two mutations
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              made in the
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              ſcope, depending on
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              the agitation of the
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              Ship.
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              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg437"/>
              * This is a Caſtle
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              ſix Italian miles
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              from
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              Venice
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              Northwards.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>It would make us immediately loſe ſight of it, for ſuch
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              a declination, though ſmall here, may import there hundreds and
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                <arrow.to.target n="marg438"/>
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              thouſands of yards.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg438"/>
              *
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              Vnnerod'
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              na,
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              the black or
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              paring of a nail.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>But if without changing the angle, keeping the tube
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              alwayes parallel to it ſelf, we ſhould transfer it ten or twelve
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              yards farther off to the right or left hand, upwards or downwards,
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              what alteration would it make as to the Tower?</s>
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            <p type="main">
              <s>SALV. </s>
              <s>The change would be abſolutely undiſcernable; for
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              that the ſpaces here and there being contained between parallel
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              rayes, the mutations made here and there, ought to be equal, and
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              becauſe the ſpace which the Inſtrument diſcovers yonder, is
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              ble of many of thoſe Towers; therefore we ſhall not loſe ſight of it.</s>
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            <p type="main">
              <s>SAGR. </s>
              <s>Returning now to the Ship, we may undoubtedly
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              firm, that the
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              Teleſcope
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              moving to the right or left, upwards, or </s>
            </p>
          </chap>
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