Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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            <s xml:id="echoid-s4985" xml:space="preserve">
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            quales, a filis, quibus globi ſuſpenduntur, percurſos.</s>
            <s xml:id="echoid-s4986" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4987" xml:space="preserve">Uthos angulos in Experimentis menſuremus, dantur
              <lb/>
            indices quatuor, duo majores M, M, & </s>
            <s xml:id="echoid-s4988" xml:space="preserve">duo minores N,
              <lb/>
            N.</s>
            <s xml:id="echoid-s4989" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4990" xml:space="preserve">Moventur indices iſti per ſciſſuras or, or; </s>
            <s xml:id="echoid-s4991" xml:space="preserve">& </s>
            <s xml:id="echoid-s4992" xml:space="preserve">cochleis à
              <lb/>
            poſteriori parte tabulæ, proarbitrio agentis, conſtituuntur.
              <lb/>
            </s>
            <s xml:id="echoid-s4993" xml:space="preserve">Tabulæ ſuperficies juxta ſciſſuras paululum excavatur, ad
              <lb/>
            motum indicum dirigendum; </s>
            <s xml:id="echoid-s4994" xml:space="preserve">majores ad tabulæ extremita-
              <lb/>
            tem pertingunt, licet ſciſſuræ extremitas ab ea fere tribus
              <lb/>
            pollicibus diſtet.</s>
            <s xml:id="echoid-s4995" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4996" xml:space="preserve">Delineatio majorum indicum datur in figura ſeparata M;
              <lb/>
            </s>
            <s xml:id="echoid-s4997" xml:space="preserve">in qua a b eſt lamina, quæ in cavitate in tabulæ ſuperficie
              <lb/>
            movetur; </s>
            <s xml:id="echoid-s4998" xml:space="preserve">c d eſt index, ad illam laminam normalis, & </s>
            <s xml:id="echoid-s4999" xml:space="preserve">lon-
              <lb/>
            gitudinis circiter trium pollicum.</s>
            <s xml:id="echoid-s5000" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5001" xml:space="preserve">Datur etiam in N figura ſeparata indicum minorum; </s>
            <s xml:id="echoid-s5002" xml:space="preserve">ho-
              <lb/>
            rum longitudo æqualis eſt ſemidiametro minimorum globo-
              <lb/>
            rum, qui Machinæ applicantur, & </s>
            <s xml:id="echoid-s5003" xml:space="preserve">quorum diameter commode
              <lb/>
            ſtatuitur unius pollicis cum ſemiſſe; </s>
            <s xml:id="echoid-s5004" xml:space="preserve">indices hi inter majores po-
              <lb/>
            nuntur, quia illis motus globorum non impeditur; </s>
            <s xml:id="echoid-s5005" xml:space="preserve">aliquan-
              <lb/>
            do ambo minores in eadem ſciſſura firmantur, quando tres
              <lb/>
            anguli ab una parte menſurandi ſunt.</s>
            <s xml:id="echoid-s5006" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5007" xml:space="preserve">In hoc caſu globus ut Q elevatur, aut poſt caſum adſcendit,
              <lb/>
            B verſus. </s>
            <s xml:id="echoid-s5008" xml:space="preserve">Ad diſponendum indicem ut menſuretur angu-
              <lb/>
            lus ille, regulæ EG, quæ eſt a parte B, extremitas G con-
              <lb/>
            jungi debet cum extremitate G alterius regulæ, poſitæ ut
              <lb/>
            ante dictum.</s>
            <s xml:id="echoid-s5009" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5010" xml:space="preserve">Cochleæ tres ferreæ F, F, F, inſerviunt ad tabulam ex-
              <lb/>
            acte in ſitu verticali diſponendam ita, ut linea AD ſit ad ho-
              <lb/>
            rizontem perpendicularis; </s>
            <s xml:id="echoid-s5011" xml:space="preserve">quod facillime præſtatur, ſuſpen-
              <lb/>
            dendo globo quocunque, & </s>
            <s xml:id="echoid-s5012" xml:space="preserve">ponendo indice majori ita, ut
              <lb/>
            filum tranſiens juxta notam in illo indice ſit parallelum li-
              <lb/>
            neæ AD.</s>
            <s xml:id="echoid-s5013" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5014" xml:space="preserve">In Experimentis circa colliſiones corporum non elaſtico-
              <lb/>
            rum, utimur globis, in forma lignea L, ex argilla molli du-
              <lb/>
            ctis.</s>
            <s xml:id="echoid-s5015" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5016" xml:space="preserve">Forma hæc L quinque partibus conſtat; </s>
            <s xml:id="echoid-s5017" xml:space="preserve">quarum </s>
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