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

Table of Notes

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          <p>
            <s xml:id="echoid-s3471" xml:space="preserve">
              <pb o="105" file="119" n="119" rhead="DE DIFFERENS INSTRUMENS. Liv III. Ch. II."/>
            doit toucher les baſes des têtes des armures, il faut qu'il ſoit bien
              <lb/>
            droit, bien adouci, & </s>
            <s xml:id="echoid-s3472" xml:space="preserve">un peu arrondi par les bords, afin que le
              <lb/>
            contact s'en faſſe mieux.</s>
            <s xml:id="echoid-s3473" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3474" xml:space="preserve">A l'égard de l'armure de l'aiman ſpherique, elle eſt compoſée de
              <lb/>
            2 coquilles d'acier qui ſe tiennent par le haut avec une charniere
              <lb/>
            aux endroits marquez 6, d'une ceinture à l'endroit 5, d'un anneau
              <lb/>
            à l'endroit 4, & </s>
            <s xml:id="echoid-s3475" xml:space="preserve">d'un porte-poids à l'endroit 2. </s>
            <s xml:id="echoid-s3476" xml:space="preserve">ll faut ſur tout que
              <lb/>
              <note position="right" xlink:label="note-119-01" xlink:href="note-119-01a" xml:space="preserve">Fig. C.</note>
            les coquilles ſoient bien fraiſées en rond par dedans, & </s>
            <s xml:id="echoid-s3477" xml:space="preserve">qu'elles joi-
              <lb/>
            gnent bien juſte la ſuperficie; </s>
            <s xml:id="echoid-s3478" xml:space="preserve">de maniere que chacune embraſſe bien
              <lb/>
            ſes poles, & </s>
            <s xml:id="echoid-s3479" xml:space="preserve">qu'elle couvre une très-grande partie de la convexité de
              <lb/>
            la pierre. </s>
            <s xml:id="echoid-s3480" xml:space="preserve">On connoît l'épaiſſeur & </s>
            <s xml:id="echoid-s3481" xml:space="preserve">largeur qui convient à cette ar-
              <lb/>
            mure par des épreuves ſemblables à celles dont nous avons parlé ci-
              <lb/>
            devant. </s>
            <s xml:id="echoid-s3482" xml:space="preserve">Au reſte les figures B & </s>
            <s xml:id="echoid-s3483" xml:space="preserve">C font aſſez connoître ce que nous
              <lb/>
            venons de dire.</s>
            <s xml:id="echoid-s3484" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3485" xml:space="preserve">C'eſt une choſe merveilleuſe que deux petits morceaux d'acier
              <lb/>
            qui font l'armure d'un aiman, ſemblent augmenter tellement ſa
              <lb/>
            force, qu'on a vû de bonnes pierres, leſquelles après avoir été ar-
              <lb/>
            mées, enlevoient plus de cent cinquante fois plus qu'@lles ne fai-
              <lb/>
            ſoient lorſqu'elles étoient nuës.</s>
            <s xml:id="echoid-s3486" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3487" xml:space="preserve">Il y a des pierres paſſablement bonnes, qui peſent nuës environ
              <lb/>
            trois onces, & </s>
            <s xml:id="echoid-s3488" xml:space="preserve">n'enlevent qu'une demie once de fer; </s>
            <s xml:id="echoid-s3489" xml:space="preserve">mais étant ar-
              <lb/>
            mées, elles levent plus de ſept livres.</s>
            <s xml:id="echoid-s3490" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3491" xml:space="preserve">Pour conſerver un aiman on le tient dans un lieu ſec parmi de pe-
              <lb/>
            tits bouts de fil d'acier: </s>
            <s xml:id="echoid-s3492" xml:space="preserve">car la limaille, qui eſt toûjours pleine de
              <lb/>
            pouſſiere, le fait roüiller.</s>
            <s xml:id="echoid-s3493" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3494" xml:space="preserve">On le ſuſpend auſſi quelquefois, afin qu'ayant la liberté de ſe
              <lb/>
            mouvoir, il ſe dirige vers les Poles du Monde.</s>
            <s xml:id="echoid-s3495" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3496" xml:space="preserve">Dans cette ſituation on lui met ſon porte-poids avec le crochet,
              <lb/>
            auquel on attache la charge qu'il porte d'ordinaire, & </s>
            <s xml:id="echoid-s3497" xml:space="preserve">de tems en
              <lb/>
            tems on y ajoûte quelque petit poids nouveau; </s>
            <s xml:id="echoid-s3498" xml:space="preserve">& </s>
            <s xml:id="echoid-s3499" xml:space="preserve">ayant continué
              <lb/>
            pendant quelques jours, on verra qu'il ſoûtient beaucoup plus de
              <lb/>
            poids qu'il ne faiſoit auparavant.</s>
            <s xml:id="echoid-s3500" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div322" type="section" level="1" n="143">
          <head xml:id="echoid-head219" style="it" xml:space="preserve">Nous allons rapporter pluſieurs experiences que l'on fait
            <lb/>
          or dinairement avec la pierre d'aiman.</head>
          <p>
            <s xml:id="echoid-s3501" xml:space="preserve">LA premiere & </s>
            <s xml:id="echoid-s3502" xml:space="preserve">la plus utile eſt celle d'aimanter les éguilles des
              <lb/>
            bouſſoles. </s>
            <s xml:id="echoid-s3503" xml:space="preserve">Pour le faire adroitement, on coule doucement & </s>
            <s xml:id="echoid-s3504" xml:space="preserve">
              <lb/>
            on tire de loin l'éguille 3 ou 4 fois ſur un des poles de l'aiman de-
              <lb/>
            puis ſon milieu juſqu'à ſon extremité; </s>
            <s xml:id="echoid-s3505" xml:space="preserve">mais il faut remarquer que le
              <lb/>
            bout de l'éguille d'une bouſſole qui a touché à un des poles de l'ai-
              <lb/>
            </s>
          </p>
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