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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INTRODUCTIO AD COHÆRENTIAM
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mus, non enim omne ferrum album eſt æque craſſum, quo id eſt
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craſſius, eo eſt fortius: </
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<
s
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">in charta major adhuc obtinet varietas,
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pro craſſitie non tantum, ſed majori minorive glutinis admixti co-
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pia, quamobrem, qui hoc Thema perpolire vellet, majori cum
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cura attendere ad omnia deberet.</
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<
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">CAPUT NONUM.</
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">De Cohærentia corporum compreſſorum.</
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<
s
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xml:space
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">Summæ utilitatis eſt cognoviſſe quantæ firmitatis ſint corpora
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oblonga, quæ horizonti perpendiculariter impoſita, ponderi-
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bus ſuſtinendis deſtinantur; </
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<
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xml:space
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">trabibus enim ſecundum longitudinem
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erectis graviſſimas ſuperſtruimus domos, moles ponderoſiſſimas im-
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ponimus; </
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<
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">imo illis fulcimus altos parietes, amplas ædes, excel-
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ſiſſimas turres, maximas naves bellicas.</
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<
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">Trabs cujuslibet craſſitiei moli utcunque gravi ſuſtinendæ par non
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eſt; </
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<
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">a nimiâ enim ſibi incumbente flectitur, incurvatur, tandem
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frangitur; </
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<
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xml:space
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">neceſſarium igitur eſt, ut exploremus & </
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quænam ſit datæ Trabis firmitas, & </
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ſitum ferre poſſit, quodnam recuſet.</
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<
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">Poſtulare autem poſſum tanquam demonſtratum, corpuſcula ul-
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tima, ſubtiliſſima, perfecte ſolida, non amplius diffringi a viribus
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comprimentibus, quas Ars vel Natura adhiberet.</
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<
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">Si fuerint corpuſcula ultima Cubi, Parallelopipeda rectangula,
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aut Hexangula ordinata, quæ maſſam majorem compoſitura ordina-
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tim ſint ſibi impoſita, ut nullum relinquant porum, & </
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corpus oblongum, rectum, poterit hæc maſſa ſuſtinere onus quod-
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cunque, premens ſecundum axin maſſæ, abſque ulla ſolutione
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ejuſve metu.</
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<
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">Concipiatur enim maſſa conſtare ex tribus cubis ita accumulatis,
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ut parallelopipedum conſtituant, cui incumbat onus premens per-
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pendiculariter latus, quod attingit; </
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medio preſſus, nequicquam cedit, quia eſt perfecte durus; </
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medius preſſus a ſupremo ob eandem rationem non cedit; </
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ſupremus cedit oneri prementi; </
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