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

Table of Notes

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          <pb o="277" file="293" n="293" rhead="POUR LA NAVIGATION. Liv. VII. Ch. II."/>
          <p>
            <s xml:id="echoid-s8738" xml:space="preserve">Si la moitié du 3
              <emph style="sub">me</emph>
            Marteau eſt de 4 à 5 pouces, on pourra mar-
              <lb/>
            quer ſur la facé qui lui convient les degrez depuis 90 juſqu'à 20.
              <lb/>
            </s>
            <s xml:id="echoid-s8739" xml:space="preserve">Enſin ſi le 4
              <emph style="sub">me</emph>
            , & </s>
            <s xml:id="echoid-s8740" xml:space="preserve">plus petit Marteau eſt de 2 pouces & </s>
            <s xml:id="echoid-s8741" xml:space="preserve">{1/2}, on pourra
              <lb/>
            marquer ſur la face qui lui convient les deg. </s>
            <s xml:id="echoid-s8742" xml:space="preserve">depuis 90 juſqu a 10.</s>
            <s xml:id="echoid-s8743" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8744" xml:space="preserve">Pour les grandes hauteurs on ſe ſert des grands Marteaux, parce
              <lb/>
            que les diviſions en ſont plus juſtes; </s>
            <s xml:id="echoid-s8745" xml:space="preserve">& </s>
            <s xml:id="echoid-s8746" xml:space="preserve">pour les moindres hauteurs
              <lb/>
            il faut ſe ſervir des petits Marteaux.</s>
            <s xml:id="echoid-s8747" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8748" xml:space="preserve">Pour trouver la face qui convient à un Marteau, il n'y a qu'à
              <lb/>
            preſenter ſa moitié ſur la Fléche; </s>
            <s xml:id="echoid-s8749" xml:space="preserve">ſi elle ſe trouve égale à la diſtan-
              <lb/>
            ce depuis l'extremité appellée le bout de l'œil, juſqu'à 90 degrez,
              <lb/>
            on aura la face convenable au Marteau.</s>
            <s xml:id="echoid-s8750" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8751" xml:space="preserve">On peut auſſi marquer méchaniquement les degrez ſur la Fléche
              <lb/>
            en la maniere ſuivante.</s>
            <s xml:id="echoid-s8752" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8753" xml:space="preserve">Il faut faire un grand Quart de cercle dont le raïon ſoit auſſi grand
              <lb/>
              <note position="right" xlink:label="note-293-01" xlink:href="note-293-01a" xml:space="preserve">Fig. 7.</note>
            que la Fléche AB. </s>
            <s xml:id="echoid-s8754" xml:space="preserve">Ce Quart de cercle doit être diviſe en degrez & </s>
            <s xml:id="echoid-s8755" xml:space="preserve">
              <lb/>
            minutes de 10 en 10; </s>
            <s xml:id="echoid-s8756" xml:space="preserve">& </s>
            <s xml:id="echoid-s8757" xml:space="preserve">après avoir paſſé la Flêche dans ſon Mar-
              <lb/>
            teau CD, en ſorte que le plat dudit Marteau ſoit tourné vers l'ex-
              <lb/>
            tremité A de la Fléche, on l'appliquera ſur le quart de cercle, de ſor-
              <lb/>
            te que le bout A réponde exactement ſur le centre du quart de cer-
              <lb/>
            cle, & </s>
            <s xml:id="echoid-s8758" xml:space="preserve">que le bout D du Marteau ſoit toûjours ſur le rayon AF. </s>
            <s xml:id="echoid-s8759" xml:space="preserve">On
              <lb/>
            approchera doucement le Marteau CD du bout A, juſqu'à ce que
              <lb/>
            ſon autre extremité C touche le raïon AM, qui paſſe par le degré
              <lb/>
            que l'on veutmarquer ſur la fléche, lequel degré on marquera à l'en-
              <lb/>
            droit où raſera le Marteau au point E, & </s>
            <s xml:id="echoid-s8760" xml:space="preserve">l'on continuëra de rappro-
              <lb/>
            cher le Marteau du centre A le long du raïon ADF, juſqu'à ce qu'il
              <lb/>
            touche ſucceſſivement les rayons de tous les degrez, pour les mar-
              <lb/>
            quer ſur une colonne le long de la fléche AB, en augmentant à meſu-
              <lb/>
            re qu'ils approchent du bout A. </s>
            <s xml:id="echoid-s8761" xml:space="preserve">On marquera auſſi les deg. </s>
            <s xml:id="echoid-s8762" xml:space="preserve">de com-
              <lb/>
            plément ſur la même face, ſur une autre colonne, leſquels vont en
              <lb/>
            diminuant de B vers A. </s>
            <s xml:id="echoid-s8763" xml:space="preserve">On pourra mettre un fil au centre A, pour
              <lb/>
            ſervir de raïon comme AM, en le tendant ſucceſſivement ſur tous
              <lb/>
            les degrez, à meſure qu'on lui fera toucher le bout C du Marteau.</s>
            <s xml:id="echoid-s8764" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8765" xml:space="preserve">On fera la même choſe ſur les autres faces pour y marquer les
              <lb/>
            diviſions, ſuivant les differens Marteaux. </s>
            <s xml:id="echoid-s8766" xml:space="preserve">La petite figure P fait
              <lb/>
            voir un Marteau vû de face avec ſon trou.</s>
            <s xml:id="echoid-s8767" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div585" type="section" level="1" n="290">
          <head xml:id="echoid-head418" style="it" xml:space="preserve">Vſage de l'Arbaleſtrille.</head>
          <p>
            <s xml:id="echoid-s8768" xml:space="preserve">POur obſerver la hauteur d'un Aſtre par devant avec l'Arbaleſ-
              <lb/>
            trille, il faut après avoir paſſé le Marteau dans la Fléche du côté
              <lb/>
            de ſa face, ſon côté plat vers le bout de l'œil A, appuïer ce même
              <lb/>
            </s>
          </p>
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