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="681" file="0697" n="698" rhead="ULTRAJECTINÆ ANN MDCCXXVIII."/>
            ex interſtitiis ſuis aëreas dimittet, quibus orbatus erit elapſo diei
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            intervallo: </s>
            <s xml:id="echoid-s17248" xml:space="preserve">tum tubum cape novum, alterutra extremitate clauſum,
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            interne bene mundum, ſiccunique, quem filo chalybeo, cujus
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            extremitati aliquantum ſiccæ puræque alutæ alligaveris, puriorem
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            reddes, aëremque a parietibus averruncabis. </s>
            <s xml:id="echoid-s17249" xml:space="preserve">Deinde Tubum æqua-
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            biliter calefac largum latumque ante focum, ne diſſiliat, ita aër
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            facilius a parietibus vitri, â quibus attractus non facile recedit,
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            avelletur: </s>
            <s xml:id="echoid-s17250" xml:space="preserve">tum Mercurium prudenter abſque concuſſione ex reci-
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            piente ſublatum eidem calori ſubmitte: </s>
            <s xml:id="echoid-s17251" xml:space="preserve">Dein tubus gracilis, priori
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            longior, & </s>
            <s xml:id="echoid-s17252" xml:space="preserve">qui cavitati illius immitti poſſit, ad fundum uſque in am-
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            pliorem inſeratur; </s>
            <s xml:id="echoid-s17253" xml:space="preserve">ejus utraque extremitas ſit aperta, alterutra au-
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            tem latior & </s>
            <s xml:id="echoid-s17254" xml:space="preserve">infundibuli inſtar, cui Mercurius facile infundi poſ-
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            ſit: </s>
            <s xml:id="echoid-s17255" xml:space="preserve">quo apparatu præmiſſo, calidus infundibulo capilliformi infun-
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            datur Mercurius, qui ita lente illapſus in fundum amplioris tubi
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            ſurſum adſcendet, aëremque expellet omnem: </s>
            <s xml:id="echoid-s17256" xml:space="preserve">tubo penitus im-
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            pleto, prudenter & </s>
            <s xml:id="echoid-s17257" xml:space="preserve">lente capilliformis extrahatur, curando ut am-
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            plior impletus maneat, ita nullam aëream bullam, utcunque aciem
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            intenderis, in tubo obſervabis: </s>
            <s xml:id="echoid-s17258" xml:space="preserve">inverſus hic tubus, vaſculo alium
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            adhuc continenti immiſſus, primum impletus uſque ad ſummitatem
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            manebit, etiamſi longitudinem 40 pollicum & </s>
            <s xml:id="echoid-s17259" xml:space="preserve">ultra habuerit, ſed
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            concuſſione cum tubo communicata, ſubſidebit Mercurius, & </s>
            <s xml:id="echoid-s17260" xml:space="preserve">ad
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            29 pollices, plus minusve hærebit, accuratiſſimum cum Atmoſphæræ
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            pondere æquilibrium ſervaturus; </s>
            <s xml:id="echoid-s17261" xml:space="preserve">Barometrum hoc modo confe-
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            ctum ſolet paulo altius ſuſpendere Mercurium, quam vulgaria: </s>
            <s xml:id="echoid-s17262" xml:space="preserve">ita
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            noſtrum, quocum obſervationes cepimus, confectum fuit; </s>
            <s xml:id="echoid-s17263" xml:space="preserve">inſi-
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            ſtens vaſculo diametri 4 pollicum, unde ſubſidente Mercurio ex
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            tubo ad 28 pollices, vel adſcendente ad 30 pollices, ne quidem
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            {1/1600} pollicis differentia in altitudine Mercurii in vaſculo ſtagnantis
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            datur; </s>
            <s xml:id="echoid-s17264" xml:space="preserve">hic apparatus æneæ impoſitus laminæ, quæ humido aëris
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            expandenti non ſubjicitur, veram altitudinem Mercurii repræſen-
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            tat: </s>
            <s xml:id="echoid-s17265" xml:space="preserve">Inveni aliam quoque methodum accurate Tubum implendi,
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            nec magis operoſam priori; </s>
            <s xml:id="echoid-s17266" xml:space="preserve">ſit Tubus ultra 40 longus pollices,
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            partem, uno pollice ab extremo diſtantem, in Lampadis flamma can-
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            defac, atque in tubum gracilem extrahe, interim extremo antliam
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            affige cæmenti ope, tubumque alliga aſſerculo, ne inter tractan-
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            dum frangatur; </s>
            <s xml:id="echoid-s17267" xml:space="preserve">poſtquam probe mundificatus eſt, calefiat </s>
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