Musschenbroek, Petrus van, Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae

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              <pb o="232" file="0246" n="246" rhead="DISSERTATIO"/>
            lubrice mobiles exiſtant, etiam magis a Septentrione declinant,
              <lb/>
            uti recte obſervavit de la Hirius in L’Hiſt. </s>
            <s xml:id="echoid-s5458" xml:space="preserve">de L’Acad. </s>
            <s xml:id="echoid-s5459" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s5460" xml:space="preserve">A°.
              <lb/>
            </s>
            <s xml:id="echoid-s5461" xml:space="preserve">1717. </s>
            <s xml:id="echoid-s5462" xml:space="preserve">Natura profecto ubivis ſimplex, ſimplicitate gaudet, quæ eo
              <lb/>
            præſtantiorem reddit machinam, quo ad ſimplicitatem plus accedit,
              <lb/>
            ars Naturam imitetur oportet, hocagnoſcentibus omnibus Mechanicis.</s>
            <s xml:id="echoid-s5463" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5464" xml:space="preserve">Non modo ex Chalybe præſtanti componendæ ſunt Acus, ſed
              <lb/>
            quoque temperandæ ſunt, ita ut colore cæruleo eleganti tingantur,
              <lb/>
            & </s>
            <s xml:id="echoid-s5465" xml:space="preserve">valde elaſticæ fiant. </s>
            <s xml:id="echoid-s5466" xml:space="preserve">præterquam quod tum non tam cito rubigi-
              <lb/>
            nem contrahant, etiam majori vi Magnetica donari poſſunt, quam
              <lb/>
            multo diutius conſervant, notante Ridleyo in Magnetical Motions
              <lb/>
            Cap. </s>
            <s xml:id="echoid-s5467" xml:space="preserve">17. </s>
            <s xml:id="echoid-s5468" xml:space="preserve">Ab hactemperatura bonitas multum pendet: </s>
            <s xml:id="echoid-s5469" xml:space="preserve">non quilibet aër
              <lb/>
            regione quacunque æque illi favet, fatemur Cœlum Britannicum
              <lb/>
            Chalybi multo plus amicum eſſe quam noſtrum; </s>
            <s xml:id="echoid-s5470" xml:space="preserve">docuit frequens
              <lb/>
            experientia noſtros artiſices, Acus ab ipſis elaboratas, & </s>
            <s xml:id="echoid-s5471" xml:space="preserve">in Bri-
              <lb/>
            tannia temperatas, majorem vim Magneticam recepiſſe, & </s>
            <s xml:id="echoid-s5472" xml:space="preserve">eam
              <lb/>
            diutius conſervaſſe; </s>
            <s xml:id="echoid-s5473" xml:space="preserve">hæc ipſe non expertus ex aliorum, ſed ſide dig-
              <lb/>
            niſſimorum, relationibus appono.</s>
            <s xml:id="echoid-s5474" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5475" xml:space="preserve">Capitulum æneum, quod medio Acus imponitur, prius terebra
              <lb/>
            aliquouſque excavatum in ſinum conicum, poſtea acuto & </s>
            <s xml:id="echoid-s5476" xml:space="preserve">polito
              <lb/>
            Chalybeo ſtylo ope Mallei adacto, percutiatur, ut ſinus pau-
              <lb/>
            lum profundior reddatur, ſed præcipue percuſſio ope ſtyli fit, ut
              <lb/>
            centrum accuratiſſime ſit unum punctum, tum ut pori melius
              <lb/>
            occludantur, & </s>
            <s xml:id="echoid-s5477" xml:space="preserve">ſimul compactius fiat metallum, ubi ſupra cu-
              <lb/>
            ſpidem acutam convertendum eſt: </s>
            <s xml:id="echoid-s5478" xml:space="preserve">intrinſecus illinitur leviſſi-
              <lb/>
            meoleo, aut quod melius eſt plumbagine, qua lubricitas notabilis affer-
              <lb/>
            tur Verſorio, neque hæc inunctio unquam negligenda: </s>
            <s xml:id="echoid-s5479" xml:space="preserve">Magnum vero
              <lb/>
            latet arcanum in cuſpide ænei ſtyli, ſupra quem vertitur Acus, hæc
              <lb/>
            eſt bene polienda, nam Acûs mobilitas imprimis ab hujus politura
              <lb/>
            pendet: </s>
            <s xml:id="echoid-s5480" xml:space="preserve">non poſtulatur ſtylus valde tenuis & </s>
            <s xml:id="echoid-s5481" xml:space="preserve">lente in ſummam a-
              <lb/>
            cutiem deſinens, potius ejuſmodi rejiciendus eſt, cupro non ſatis
              <lb/>
            pondus ipſius Acûs in tam tenui maſſa ſuſtinente, quin inflectatur,
              <lb/>
            ſed cuſpis fiat ex obtuſo cito acuta, ſit rotundiſſima, & </s>
            <s xml:id="echoid-s5482" xml:space="preserve">lævigetur
              <lb/>
            ſupra lapidem Lydium, vel cotem mollem Lotharingienſem, qui nova-
              <lb/>
            culis acuendis inſervit, neulla lateralis aſperitas emineat, niſi hoc arti-
              <lb/>
            ficium bene obſervetur, nunquam lubrice movebitur Verſorium. </s>
            <s xml:id="echoid-s5483" xml:space="preserve">Suf-
              <lb/>
            ſiciat hæc in genere notaſſe de fabricâ Verſoriorum, ea enim, </s>
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