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-div323" type="section" level="1" n="144">
          <p>
            <s xml:id="echoid-s3617" xml:space="preserve">
              <pb o="109" file="123" n="123" rhead="DE DIFFERENS INSTRUMENS. Liv.III. Ch. II."/>
            qui ayent environ dix pouces de longueur, un pouce de largeur,
              <lb/>
            & </s>
            <s xml:id="echoid-s3618" xml:space="preserve">demi-ligne d'épaiſſeur: </s>
            <s xml:id="echoid-s3619" xml:space="preserve">il ſeroit inutile deles faire plus épaiſſes,
              <lb/>
            parce que la vertu magnetique ne ſe communique pas plus avant
              <lb/>
            dans l'acier.</s>
            <s xml:id="echoid-s3620" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3621" xml:space="preserve">Ces lames étant aimantées avec une bonne pierre, on les place l'u-
              <lb/>
            ne ſur l'autre, ſuivant leurs plus larges ſurfaces, ayant leurs poles de
              <lb/>
            même nom tournez du même côté formant un parallelipipede rec-
              <lb/>
            tangle. </s>
            <s xml:id="echoid-s3622" xml:space="preserve">Ces lames ſont preſlées par quatre étriers de laiton, & </s>
            <s xml:id="echoid-s3623" xml:space="preserve">au-
              <lb/>
            tant de petits coins de même matiere, marquez 3, & </s>
            <s xml:id="echoid-s3624" xml:space="preserve">terminez par 2
              <lb/>
            armures de fer, de longueur, largeur & </s>
            <s xml:id="echoid-s3625" xml:space="preserve">épaiſſeur convenables. </s>
            <s xml:id="echoid-s3626" xml:space="preserve">La ba-
              <lb/>
            ſe de leurs têtes a environ 2 pouces de largeur. </s>
            <s xml:id="echoid-s3627" xml:space="preserve">Ces armures ſont re-
              <lb/>
            tenuës par une ceinture de laiton, & </s>
            <s xml:id="echoid-s3628" xml:space="preserve">ſerrées avec des vis marquées
              <lb/>
            2. </s>
            <s xml:id="echoid-s3629" xml:space="preserve">Il y a une plaque de laiton qui les couvre par deſſus, à laquelle eſt
              <lb/>
            attaché le pendant avec ſon anneau, & </s>
            <s xml:id="echoid-s3630" xml:space="preserve">au-deſſous eſt ſon porte-
              <lb/>
            poids marqué 5. </s>
            <s xml:id="echoid-s3631" xml:space="preserve">Il faut faire en ſorte que le deſſus du porte-poids
              <lb/>
            faſſe un contact le plus parfait qu'il eſt poſſible avec les têtes des ar-
              <lb/>
            mures. </s>
            <s xml:id="echoid-s3632" xml:space="preserve">Quand les aimans artificiels ſont bien faits, & </s>
            <s xml:id="echoid-s3633" xml:space="preserve">touchez avec
              <lb/>
            de bonnes pierres, ils ont autant de vertu que les bons aimans natu-
              <lb/>
            rels, & </s>
            <s xml:id="echoid-s3634" xml:space="preserve">on peut s'en ſervir pour faire les mêmes experiences.</s>
            <s xml:id="echoid-s3635" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div325" type="section" level="1" n="145">
          <head xml:id="echoid-head221" style="it" xml:space="preserve">Conſtruction du Peſon àreſſort.</head>
          <p>
            <s xml:id="echoid-s3636" xml:space="preserve">CEtte machine eſt un peſon qui ſe peut porter aiſément à la po-
              <lb/>
              <note position="right" xlink:label="note-123-01" xlink:href="note-123-01a" xml:space="preserve">Fig.D</note>
            che, & </s>
            <s xml:id="echoid-s3637" xml:space="preserve">dont on ſe ſert bien facilement pour peſer un poids, de-
              <lb/>
            puis une livre juſqu'à environ 40.</s>
            <s xml:id="echoid-s3638" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3639" xml:space="preserve">Cet inſtrument eſt compoſé d'un tuïau ou canon de cuivre bou-
              <lb/>
            ché par les deux bouts, long de 4 à 5 pouces, & </s>
            <s xml:id="echoid-s3640" xml:space="preserve">large de 7 à 8 li-
              <lb/>
            gnes, dont on voit un bout marqué 3, le reſte étant ouvert pour fai-
              <lb/>
            re voir le dedans, quieſtun reſſort de fil d'acier trempé, fait en ma-
              <lb/>
            niere de vis, comme un tire-boure d'arquebuſe, marqué 2. </s>
            <s xml:id="echoid-s3641" xml:space="preserve">Il y a par
              <lb/>
            le bout d'en haut une petite virole marquée 6, qui a un trou quarré
              <lb/>
            par où paſſe une verge de cuivre marquée 1, quieſt auſſi quarrée, & </s>
            <s xml:id="echoid-s3642" xml:space="preserve">
              <lb/>
            qui traverſe le reſſort, ſur laquelle verge ſont les diviſions des livres
              <lb/>
            qu'on y a marquées, en mettant ſuccſſivement au crochet marqué
              <lb/>
            4 un poids d'1, 2, 3 livres, &</s>
            <s xml:id="echoid-s3643" xml:space="preserve">c. </s>
            <s xml:id="echoid-s3644" xml:space="preserve">ſuivant qu'on veut que le peſon
              <lb/>
            porte de poids; </s>
            <s xml:id="echoid-s3645" xml:space="preserve">on écrit auſſi les chifres de 5 en 5, ſur la verge, & </s>
            <s xml:id="echoid-s3646" xml:space="preserve">le
              <lb/>
            lieu où elle ſe trouvera coupée par le bord du trou quarré, marquera
              <lb/>
            les livres; </s>
            <s xml:id="echoid-s3647" xml:space="preserve">ce qui arrivera en divers points par les differens poids
              <lb/>
            attachez au crochet 4, qui par leur péſanteur feront étendre & </s>
            <s xml:id="echoid-s3648" xml:space="preserve">re-
              <lb/>
            trecir le reſſort, & </s>
            <s xml:id="echoid-s3649" xml:space="preserve">en même tems ſortir en dehors une plus grande
              <lb/>
            ou plus petite partie de la verge, qui doit être arrêtée par le bout
              <lb/>
            d'en bas au reſſort par une petite vis.</s>
            <s xml:id="echoid-s3650" xml:space="preserve"/>
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