Bion, Nicolas, Traité de la construction et principaux usages des instruments de mathématique, 1723

Table of Notes

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        <div xml:id="echoid-div573" type="section" level="1" n="283">
          <p>
            <s xml:id="echoid-s8588" xml:space="preserve">
              <pb o="273" file="289" n="289" rhead="POUR LA NAVIGATION. Liv. VII. Chap. II."/>
            que la vraie, cela vient de ce que l'Eſt de la Bouſſole ſe reculant du
              <lb/>
            Soleil vers le Sud, la Fleur-de-Lys de la roſe s'approche de l'Eſt,
              <lb/>
            & </s>
            <s xml:id="echoid-s8589" xml:space="preserve">donne la variation Nord-Eſt. </s>
            <s xml:id="echoid-s8590" xml:space="preserve">La raiſon pour le contraire eſt é-
              <lb/>
            galement évidente.</s>
            <s xml:id="echoid-s8591" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8592" xml:space="preserve">Si l'amplitude Orientale calculée eſt du côté du Sud, auſſi-bien
              <lb/>
            que l'amplitude obſervée, & </s>
            <s xml:id="echoid-s8593" xml:space="preserve">que celle ci ſoit la plus grande, la dé-
              <lb/>
            clinaiſon de l'éguille ſera Nord-Oüeſt. </s>
            <s xml:id="echoid-s8594" xml:space="preserve">Si au contraire elle eſt plus
              <lb/>
            petite, la déclinaiſon ſera Nord-Eſt d'autant de degrez que ſera leur
              <lb/>
            difference.</s>
            <s xml:id="echoid-s8595" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8596" xml:space="preserve">Ce que nous avons dit des amplitudes Orientales Nord, ſe doit
              <lb/>
            entendre pour les amplitudes Occidentales Sud; </s>
            <s xml:id="echoid-s8597" xml:space="preserve">& </s>
            <s xml:id="echoid-s8598" xml:space="preserve">ce que nous a-
              <lb/>
            vons dit des amplitudes Orientales Sud, ſe doit entendre pour les
              <lb/>
            amplitudes Occidentales Nord.</s>
            <s xml:id="echoid-s8599" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8600" xml:space="preserve">Enſin ſi les amplitudes ſe trouvent de differente dénomination,
              <lb/>
            par exemple, aux amplitudes Orientales, ſi l'amplitude calculée eſt
              <lb/>
            de 6 d. </s>
            <s xml:id="echoid-s8601" xml:space="preserve">Nord, & </s>
            <s xml:id="echoid-s8602" xml:space="preserve">que l'obſervée ſoit de 5 d. </s>
            <s xml:id="echoid-s8603" xml:space="preserve">Sud, c'eſt une marque
              <lb/>
            que la variation, qui dans ce cas ſera NO, ſe trouve plus gran-
              <lb/>
            de que la vraie amplitude, étant égale à la ſomme des deux ampli-
              <lb/>
            tudes, vraie & </s>
            <s xml:id="echoid-s8604" xml:space="preserve">obſervée; </s>
            <s xml:id="echoid-s8605" xml:space="preserve">c'eſt pourquoi les ajoûtant enſemble on
              <lb/>
            aura 11 d. </s>
            <s xml:id="echoid-s8606" xml:space="preserve">de variation NO. </s>
            <s xml:id="echoid-s8607" xml:space="preserve">Il en ſeroit de même pour les ampli-
              <lb/>
            tudes Occidentales.</s>
            <s xml:id="echoid-s8608" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8609" xml:space="preserve">On peut encore trouver la variation de l'éguille aimantée à tou-
              <lb/>
            te heure par l'Azimut d'un Aſtre, ayant ſa hauteur & </s>
            <s xml:id="echoid-s8610" xml:space="preserve">ſa déclinai-
              <lb/>
            ſon avec la latitude du lieu, comme nous l'avons expliqué dans les
              <lb/>
            Uſages 26 & </s>
            <s xml:id="echoid-s8611" xml:space="preserve">27 du Livre qui a pour titre Uſage des Aſtrolabes.</s>
            <s xml:id="echoid-s8612" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div574" type="section" level="1" n="284">
          <head xml:id="echoid-head411" xml:space="preserve">
            <emph style="bf">CHAPITRE II.</emph>
          </head>
          <head xml:id="echoid-head412" style="it" xml:space="preserve">De la Conſtruction & Vſage des Inſtrumens qui ſervent à
            <lb/>
          obſerver la hauteur des Aſtres.
            <lb/>
          De l'Aſtrolabe de Mer.</head>
          <p>
            <s xml:id="echoid-s8613" xml:space="preserve">LE plus ordinaire des Inſtrumens pour prendre hauteur en Mer,
              <lb/>
              <note position="right" xlink:label="note-289-01" xlink:href="note-289-01a" xml:space="preserve">Fig. 4.</note>
            eſt l'Aſtrolabe. </s>
            <s xml:id="echoid-s8614" xml:space="preserve">C'eſt un cercle de cuivre d'environ un pied de
              <lb/>
            diametre, & </s>
            <s xml:id="echoid-s8615" xml:space="preserve">de 6 à 7 lig. </s>
            <s xml:id="echoid-s8616" xml:space="preserve">d'épaiſſeur, afin qu'il ait du poids: </s>
            <s xml:id="echoid-s8617" xml:space="preserve">quelque-
              <lb/>
            fois on y attache encore un poids de 5 à 6 liv. </s>
            <s xml:id="echoid-s8618" xml:space="preserve">à l'endroit marqué B,
              <lb/>
            afin qu'étant ſuſpendu par ſon anneau A, qui doit être bien mobile,
              <lb/>
            il ſe puiſſe tourner facilement de toutes parts, & </s>
            <s xml:id="echoid-s8619" xml:space="preserve">garder la ſituation
              <lb/>
            perpendiculaire pendant les mouvemens du Navire.</s>
            <s xml:id="echoid-s8620" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8621" xml:space="preserve">Il eſt diviſé en 4 fois 90 d. </s>
            <s xml:id="echoid-s8622" xml:space="preserve">& </s>
            <s xml:id="echoid-s8623" xml:space="preserve">fort ſouvent en demis & </s>
            <s xml:id="echoid-s8624" xml:space="preserve">quarts de
              <lb/>
            degré.</s>
            <s xml:id="echoid-s8625" xml:space="preserve"/>
          </p>
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