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-div495" type="section" level="1" n="238">
          <p>
            <s xml:id="echoid-s6340" xml:space="preserve">
              <pb o="199" file="214" n="214" rhead="DE LA JAUGE. Liv. V. Chap. III."/>
            ſemble toutes celles qui ont été meſurées; </s>
            <s xml:id="echoid-s6341" xml:space="preserve">ſçavoir,</s>
          </p>
          <note position="right" xml:space="preserve">
            <lb/>
          La premiere de # 1000 toiſes.
            <lb/>
          La ſeconde de # 650
            <lb/>
          La troiſiéme de # 500
            <lb/>
          La quatriéme de # 450
            <lb/>
          Total des diſtances # 2600 # toiſes.
            <lb/>
          </note>
          <p>
            <s xml:id="echoid-s6342" xml:space="preserve">Enfin diviſant la pente par le nombre des toiſes de diſtance,
              <lb/>
            on trouvera qu'il y a pour chaque centaine de toiſes deux pouces
              <lb/>
            neuf lignes de pente, peu plus.</s>
            <s xml:id="echoid-s6343" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div496" type="section" level="1" n="239">
          <head xml:id="echoid-head355" xml:space="preserve">CHAPITRE III.</head>
          <head xml:id="echoid-head356" style="it" xml:space="preserve">De la Conſtruction & Vſage de la fauge, pour le partage
            <lb/>
          des Eaux.</head>
          <p>
            <s xml:id="echoid-s6344" xml:space="preserve">CEtte Jauge ſert à connoítre la quantité d'eau que fournit un
              <lb/>
              <note position="right" xlink:label="note-214-02" xlink:href="note-214-02a" xml:space="preserve">Fig. M.</note>
            ſource. </s>
            <s xml:id="echoid-s6345" xml:space="preserve">On la fait ordinairement d'un Vaiſſeau parallelipipe-
              <lb/>
            de rectangle de cuivre, bien ſoudé, d'environ un pied de long, 8
              <lb/>
            pouces de large & </s>
            <s xml:id="echoid-s6346" xml:space="preserve">autant de hauteur, plus ou moins, ſuivant la
              <lb/>
            quantité d'eau qu'on veut meſurer. </s>
            <s xml:id="echoid-s6347" xml:space="preserve">On y perce pluſieurs trous cir-
              <lb/>
            culaires très-exactement, d'un pouce de diametre, & </s>
            <s xml:id="echoid-s6348" xml:space="preserve">d'autres pour
              <lb/>
            qu'il paſſe un demipouce d'eau, & </s>
            <s xml:id="echoid-s6349" xml:space="preserve">d'autres pour qu'il en en paſſe un
              <lb/>
            quart de pouce. </s>
            <s xml:id="echoid-s6350" xml:space="preserve">Tous ces trous doivent être percez de maniere que
              <lb/>
            leurs centres ſoient à même hauteur. </s>
            <s xml:id="echoid-s6351" xml:space="preserve">Les extrémitez ſupérieures
              <lb/>
            des trous d'un pouce doivent être à 2 lignes près du haut de la Jau-
              <lb/>
            ge; </s>
            <s xml:id="echoid-s6352" xml:space="preserve">on bouche ces trous avec de petites plaques de cuivre quar-
              <lb/>
            rées, & </s>
            <s xml:id="echoid-s6353" xml:space="preserve">qui ſont ajuſtées dans des couliſſes marquées 1, 2, & </s>
            <s xml:id="echoid-s6354" xml:space="preserve">3. </s>
            <s xml:id="echoid-s6355" xml:space="preserve">Il
              <lb/>
            y a une bande de cuivre mince, qui traverſe le Vaiſſeau à l'endroit
              <lb/>
            marqué 4 Elle eſt arrêtée environ à un pouce du fond & </s>
            <s xml:id="echoid-s6356" xml:space="preserve">percée de
              <lb/>
            pluſieurs trous, afin que l'eau y paſſe plus librement. </s>
            <s xml:id="echoid-s6357" xml:space="preserve">Elle eſt faite
              <lb/>
            pour recevoir le choc de l'eau qui tombe de la ſource dans ladite
              <lb/>
            Jauge, & </s>
            <s xml:id="echoid-s6358" xml:space="preserve">empêcher qu'elle ne faſſe des vagues, & </s>
            <s xml:id="echoid-s6359" xml:space="preserve">faire qu'elle ſorte
              <lb/>
            plus naturellement par les ouvertures.</s>
            <s xml:id="echoid-s6360" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6361" xml:space="preserve">Il eſt à remarquer que les trous qui donnent un pouce cylindri-
              <lb/>
            que d'eau, doivent avoir 12 lignes juſte de diametre; </s>
            <s xml:id="echoid-s6362" xml:space="preserve">celui d'unde-
              <lb/>
            mi pouce doit avoir 8 lignes & </s>
            <s xml:id="echoid-s6363" xml:space="preserve">demi, & </s>
            <s xml:id="echoid-s6364" xml:space="preserve">celui d'un quart de pouce
              <lb/>
            doit être de 6 lignes juſte. </s>
            <s xml:id="echoid-s6365" xml:space="preserve">Cela ſe trouve facilement par le calcul.</s>
            <s xml:id="echoid-s6366" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6367" xml:space="preserve">Pour ſe ſervir de cet inſtrument, il faut le placer de maniere que
              <lb/>
            ſon fonds ſoit horiſontal & </s>
            <s xml:id="echoid-s6368" xml:space="preserve">ſes côtez bien perpendiculaires, puis fai-
              <lb/>
            </s>
          </p>
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