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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            <s xml:id="echoid-s5483" xml:space="preserve">
              <pb o="233" file="0247" n="247" rhead="DE MAGNETE."/>
            nauticos ſpectant Compaſſos, praetereo, cum ad obſervationesac-
              <lb/>
            curatas capiendas non multum conducunt, qui hæc tamen deſide-
              <lb/>
            rat, adeat Ricciolum, Gilbertum, Kircherum alioſque: </s>
            <s xml:id="echoid-s5484" xml:space="preserve">Accedamusad
              <lb/>
            Macbinæ Noſtræ Declinatoriæ deſcriptionem, quam ſecundum no-
              <lb/>
            ſtrum propoſitum fabrefecit dexterrimus artifex Amſtelodamenſis,
              <lb/>
            Didericus Mets, eamque ad ſummam perfectionem deduxit, ut
              <lb/>
            nihil commodius, nihil elegantius, nihil accuratius ab arte huma-
              <lb/>
            na exſpectari aut deſiderari poſſit, ſufficit artificis nomen, per totum
              <lb/>
            Terrarum orbem inclytum, tantum commemoraſſe, ad Inſtrumenti
              <lb/>
            concinnitatem & </s>
            <s xml:id="echoid-s5485" xml:space="preserve">elegantiam indicandam. </s>
            <s xml:id="echoid-s5486" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s5487" xml:space="preserve">9. </s>
            <s xml:id="echoid-s5488" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s5489" xml:space="preserve">2. </s>
            <s xml:id="echoid-s5490" xml:space="preserve">& </s>
            <s xml:id="echoid-s5491" xml:space="preserve">3. </s>
            <s xml:id="echoid-s5492" xml:space="preserve">eam,
              <lb/>
            ſed multo minorem, repræſentat: </s>
            <s xml:id="echoid-s5493" xml:space="preserve">Eſt A C B Acus Chalybea, 6
              <lb/>
            pollices longa, cujus utrique extremitati A & </s>
            <s xml:id="echoid-s5494" xml:space="preserve">B arcus tenues cuprei
              <lb/>
            ope parvarum cochlearum ſunt impoſiti, qualis eſt E A D, ſunt hi
              <lb/>
            arcus utrimque æque graves & </s>
            <s xml:id="echoid-s5495" xml:space="preserve">æque magni, ut Acus impoſita ſtylo
              <lb/>
            G oſcillari poſſit in plano horizontali, haud aliter ac ſi arcus ab-
              <lb/>
            fuiſſent: </s>
            <s xml:id="echoid-s5496" xml:space="preserve">eſt pondus totius hujus apparatus 229 granorum Medico-
              <lb/>
            rum. </s>
            <s xml:id="echoid-s5497" xml:space="preserve">Eſt L O M capſula ænea, diametri 8 pollicum, in cujus
              <lb/>
            centro ſtylus æneus G eſt poſitus, cochleâ ſurſum deorſumve mo-
              <lb/>
            bilis: </s>
            <s xml:id="echoid-s5498" xml:space="preserve">capſulam internam ambit margo S, P, qui eſt annulus latus
              <lb/>
            planuſque, quater in 90 gradus diviſus: </s>
            <s xml:id="echoid-s5499" xml:space="preserve">Arcus A E ab A ad E con-
              <lb/>
            tinet 60 gradus, qui æquales ſunt 61 gradibus annulo S Pinſculptis,
              <lb/>
            quo artiſicio indicantur gradus & </s>
            <s xml:id="echoid-s5500" xml:space="preserve">Minuta, quibus Acus a vero Sep-
              <lb/>
            tentrione declinat: </s>
            <s xml:id="echoid-s5501" xml:space="preserve">in hoc annulo Acus cum arcubus libere conver-
              <lb/>
            titur, ita tamen ut modo {1/100} pollicis arcus ab annulo diſtent: </s>
            <s xml:id="echoid-s5502" xml:space="preserve">eſt
              <lb/>
            F L M K O lamella ænea firma, 2 pedes longa, cujus extremum
              <lb/>
            F L M K in Acumen deſinit, ut conſpici poſſit an accurate congruat
              <lb/>
            cum linea Meridiana, cui machina imponi debet: </s>
            <s xml:id="echoid-s5503" xml:space="preserve">prima nota di-
              <lb/>
            viſionis in annulo S tranſit accurate per F L M K, ſuperius tegitur
              <lb/>
            capſula vitro plano, ne aëris acceſſus Acum moveat, aut rubiginem
              <lb/>
            inducat, impoſita hac machina lineæ Meridianæ prius accurate de-
              <lb/>
            ſcriptæ, obſervatur illico Declinatio Acus in gradibus & </s>
            <s xml:id="echoid-s5504" xml:space="preserve">minutis.</s>
            <s xml:id="echoid-s5505" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5506" xml:space="preserve">Adnotare oportet, ne machina imponatur ſolo ligneo clavis fer-
              <lb/>
            reis conjuncto, vel ne in vicinia ferramenti cujuſcunque fuerit,
              <lb/>
            tum ne obſervator claves ſecum ferreas habeat, aut quodcunque aliud
              <lb/>
            ferramentum, ſecus enim erroneas obſervationes inſtituet, imo me-
              <lb/>
            mini ab aciculis fibulæ, quibus calcei adducuntur, </s>
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