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-div702" type="section" level="1" n="367">
          <pb o="356" file="372" n="372" rhead="CONSTRUCTION ET USAGES"/>
          <head xml:id="echoid-head505" xml:space="preserve">USAGE.</head>
          <p>
            <s xml:id="echoid-s11622" xml:space="preserve">FAites couler le Curſeur, arrêtez le trou qui porte la ſoie, ſur le
              <lb/>
            degré du Signe ou ſur le jour du mois courant; </s>
            <s xml:id="echoid-s11623" xml:space="preserve">faites auſſi cou-
              <lb/>
            ler la petite perle ou tête d'épingle au long de la ſoie juſqu'à ce qu'el-
              <lb/>
            le ſoit ſur le point de 12 h. </s>
            <s xml:id="echoid-s11624" xml:space="preserve">expoſez au Soleil la pinule P, & </s>
            <s xml:id="echoid-s11625" xml:space="preserve">hauſ-
              <lb/>
            ſez ou baiſſez le Cadran juſqu'à ce que le raïon du Soleil paſſe par
              <lb/>
            les deux pinules, & </s>
            <s xml:id="echoid-s11626" xml:space="preserve">que la ſoie du plomb raſe le Plan. </s>
            <s xml:id="echoid-s11627" xml:space="preserve">L'endroit des
              <lb/>
            heures où ſera la perle ſera l'heure preſente.</s>
            <s xml:id="echoid-s11628" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div704" type="section" level="1" n="368">
          <head xml:id="echoid-head506" xml:space="preserve">Conſtruction du Cadran rectiligne univerſel.</head>
          <p>
            <s xml:id="echoid-s11629" xml:space="preserve">LA figure 5 repreſente un Cadran rectiligne qui peut ſervir pour
              <lb/>
            toutes les differentes latitudes ou élevations de Pole. </s>
            <s xml:id="echoid-s11630" xml:space="preserve">Il ſe fait
              <lb/>
            ſur une Platine de cuivre ou d'autre matiere ſolide bien unie, gran-
              <lb/>
            de à volonté, épaiſſe à proportion.</s>
            <s xml:id="echoid-s11631" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s11632" xml:space="preserve">Pour le conſtruire tirez les lignes AB, CD, s'entre-coupant à
              <lb/>
              <note position="left" xlink:label="note-372-01" xlink:href="note-372-01a" xml:space="preserve">Fig. 5.</note>
            angles droits au point E; </s>
            <s xml:id="echoid-s11633" xml:space="preserve">duquel, comme centre, décrivez le Quart
              <lb/>
            de cercle AF, & </s>
            <s xml:id="echoid-s11634" xml:space="preserve">le diviſez en 90 d. </s>
            <s xml:id="echoid-s11635" xml:space="preserve">Du point E faites un triangle
              <lb/>
            des Signes par la méthode expliquée au Chapitre 2. </s>
            <s xml:id="echoid-s11636" xml:space="preserve">Diviſez cha-
              <lb/>
            que Signe de 10 en 10 d. </s>
            <s xml:id="echoid-s11637" xml:space="preserve">& </s>
            <s xml:id="echoid-s11638" xml:space="preserve">placez les premieres Lettres des mois
              <lb/>
            aux endroits qui leur conviennent, en ſuppoſant, comme nous a-
              <lb/>
            vons déja dit l'entrée du Soleil en chaque Signe le 20 des mois
              <lb/>
            comme, par exemple, ſon entrée en ♈, le 20 de Mars, ſon entrée
              <lb/>
            dans le ♉, le 20 d'Avril, & </s>
            <s xml:id="echoid-s11639" xml:space="preserve">ainſi de ſuite; </s>
            <s xml:id="echoid-s11640" xml:space="preserve">ce qui ſe peut faire ſans
              <lb/>
            erreur ſenſible ſur un ſi petit Inſtrument. </s>
            <s xml:id="echoid-s11641" xml:space="preserve">Tirez enſuite du centre
              <lb/>
            E, par les diviſions du quart de cercle des lignes ponctuées juſqu'à
              <lb/>
            la ligne AG, pour la diviſer en des points, deſquels vous menerez
              <lb/>
            des paralleles à la ligne AB, qui ſeront les differentes latitudes ou
              <lb/>
            hauteurs de Pole, que vous marquerez ſeulement entre les deux
              <lb/>
            Tropiques, comme on les voit ſur cette figure, où elles ont été tra-
              <lb/>
            cées de 5 en 5 d. </s>
            <s xml:id="echoid-s11642" xml:space="preserve">Du point B portez de part & </s>
            <s xml:id="echoid-s11643" xml:space="preserve">d'autre ſur la ligne
              <lb/>
            BH, les diviſions des Signes pris au grand triangle ſur la latitude
              <lb/>
            de 45 d. </s>
            <s xml:id="echoid-s11644" xml:space="preserve">pour y faire la repreſentation d'un autre Zodiaque.</s>
            <s xml:id="echoid-s11645" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s11646" xml:space="preserve">Pour tracer les lignes horaires ſur ce Cadran, tirez de 15 en 15 d.
              <lb/>
            </s>
            <s xml:id="echoid-s11647" xml:space="preserve">au Quart de cercle AF, des lignes paralleles à ED, qui ſera la ligne
              <lb/>
            de 6 h. </s>
            <s xml:id="echoid-s11648" xml:space="preserve">le point A pour minuit; </s>
            <s xml:id="echoid-s11649" xml:space="preserve">tranſportez avec un Compas les
              <lb/>
            mêmes diſtances depuis la ligne ED allant vers B, qui ſera le point
              <lb/>
            de midi. </s>
            <s xml:id="echoid-s11650" xml:space="preserve">Pour les demi-heures prenez au Quart de cercle 7 d. </s>
            <s xml:id="echoid-s11651" xml:space="preserve">30
              <lb/>
            m. </s>
            <s xml:id="echoid-s11652" xml:space="preserve">& </s>
            <s xml:id="echoid-s11653" xml:space="preserve">tirez d'autres paralleles entre les lignes des heures.</s>
            <s xml:id="echoid-s11654" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s11655" xml:space="preserve">On peut encore tracer les heures par le moyen d'un Cercle, dont
              <lb/>
            </s>
          </p>
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