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

Table of Notes

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            <s xml:id="echoid-s8492" xml:space="preserve">
              <pb o="270" file="286" n="286" rhead="CONSTRUCT. ET USAGES DES INSTRUMENS"/>
            réduite de la maniere que nous dirons ci-après, quelle doit être la
              <lb/>
            direction du Navire, & </s>
            <s xml:id="echoid-s8493" xml:space="preserve">nous remarquons que la route ſe doit faire
              <lb/>
            entre le Sud-Oüeſt & </s>
            <s xml:id="echoid-s8494" xml:space="preserve">le Sud Sud-Oüeſt, c'eſt-à-dire, ſelon la ligne
              <lb/>
            qui tend au Sud-Oüeſt quart au Sud; </s>
            <s xml:id="echoid-s8495" xml:space="preserve">c'eſt pourquoi ayant le vent
              <lb/>
            propre on tournera le gouvernail du Navire de maniere que la ligne
              <lb/>
            du Sud-Oüeſt quart au Sud, réponde exactement à la croix marquée
              <lb/>
            ſur le bord du cadre de la Bouſſole; </s>
            <s xml:id="echoid-s8496" xml:space="preserve">& </s>
            <s xml:id="echoid-s8497" xml:space="preserve">ce qui eſt admirable, c'eſt que
              <lb/>
            par ce moïen on peut diriger la route du Vaiſſeau de nuit comme de
              <lb/>
            jour; </s>
            <s xml:id="echoid-s8498" xml:space="preserve">dans une chambre fermée comme ſi on étoit à l'air; </s>
            <s xml:id="echoid-s8499" xml:space="preserve">dans un
              <lb/>
            tems obſcur, comme dans un tems ſerein; </s>
            <s xml:id="echoid-s8500" xml:space="preserve">de telle ſorte que l'on
              <lb/>
            pourra toûjours reconnoître ſi le Navire s'écarte de la route qu'il
              <lb/>
            doit tenir.</s>
            <s xml:id="echoid-s8501" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div571" type="section" level="1" n="281">
          <head xml:id="echoid-head408" style="it" xml:space="preserve">De la variation ou déclinaiſon de l'Aiman.</head>
          <p>
            <s xml:id="echoid-s8502" xml:space="preserve">L'Experience nous a fait connoître que l'éguille aimantée décli-
              <lb/>
            ne du vrai Septentrion, c'eſt-à-dire, que la Fleur-de-Lys ne
              <lb/>
            tend pas exactement au Nord du Monde; </s>
            <s xml:id="echoid-s8503" xml:space="preserve">mais qu'elle s'en écarte
              <lb/>
            quelquefois vers l'Orient, d'autrefois vers l'Occident, plus ou
              <lb/>
            moins, ſelon les tems & </s>
            <s xml:id="echoid-s8504" xml:space="preserve">les lieux differens.</s>
            <s xml:id="echoid-s8505" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8506" xml:space="preserve">Environ l'an 1665, elle n'av oit aucune déclinaiſon à Paris, au
              <lb/>
            lieu qu'à preſent ſa déclinaiſon y eſt de plus de 12 d. </s>
            <s xml:id="echoid-s8507" xml:space="preserve">du Septentrion
              <lb/>
            vers l'Occident. </s>
            <s xml:id="echoid-s8508" xml:space="preserve">C'eſt pourquoi il ſaut tâcher d'obſerver avec ſoin
              <lb/>
            la déclinaiſon de l'éguille aimantée toutes les fois qu'on en trouve
              <lb/>
            l'occaſion favorable, afin d'y avoir égard dans la conduite de la
              <lb/>
            Navigation.</s>
            <s xml:id="echoid-s8509" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8510" xml:space="preserve">Car ſi, par exemple, la déclinaiſon de l'éguille aimantée étoit de
              <lb/>
            10 d. </s>
            <s xml:id="echoid-s8511" xml:space="preserve">du Nord à l'Oüeſt dans l'Iſle d'Oüeſſant, que nous avons ſup-
              <lb/>
            poſée le lieu du départ du Navire, & </s>
            <s xml:id="echoid-s8512" xml:space="preserve">que l'on ſuivît exactement la li-
              <lb/>
            gne de Sud-Oüeſt quart au Sud, au lieu d'aller au Cap de Finiſterre
              <lb/>
            on iroit vers une autre contrée plus Orientale de 10 deg.</s>
            <s xml:id="echoid-s8513" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8514" xml:space="preserve">Pour y remedier, il n'y a qu'à changer de place ſur le cadre de la
              <lb/>
            Bouſſole, la croix qui marque le rumb de direction, & </s>
            <s xml:id="echoid-s8515" xml:space="preserve">la reculer vers
              <lb/>
            Eſt d'autant de degrez qu'eſt la déclinaiſon de l'éguille vers Oüeſt;
              <lb/>
            </s>
            <s xml:id="echoid-s8516" xml:space="preserve">& </s>
            <s xml:id="echoid-s8517" xml:space="preserve">ainſi toutes les fois qu'on aura reconnu une nouvelle déclinaiſon
              <lb/>
            de l'aiman, il ſaudra changer le lieu de ladite croix. </s>
            <s xml:id="echoid-s8518" xml:space="preserve">Quand la boë-
              <lb/>
            te eſt toute ronde on fait une marque au corps de ladite boëte, vis-
              <lb/>
            à-vis du Nord & </s>
            <s xml:id="echoid-s8519" xml:space="preserve">Sud.</s>
            <s xml:id="echoid-s8520" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8521" xml:space="preserve">Si pareillement un Vaiſſeau part des Sorlingues en Angleterre,
              <lb/>
            pour aller à l'lſle de Madere, nous trouverons ſur la Carte Marine
              <lb/>
            que la route ſe doit ſaire au Sud Sud-Oüeſt; </s>
            <s xml:id="echoid-s8522" xml:space="preserve">mais ſi dans ce tems la
              <lb/>
            </s>
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