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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DE MAGNETE.
"/>
Plumbi additum fuit, quod cum corporibus pluribus terreſtribus,
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& </
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xml:space
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">imprimis cum ſilicibus abit in vitrum elegans, pellucidum, fla-
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vum, pulchritudine certans cum Pruſſico ſuccino: </
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<
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xml:space
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">Primum igitur
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indagandum erat, cum quanta copia Minii Magnes in vitrum redu-
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ceretur, a minima Minii quantitate incipiendum fuit, ut certior
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ſierem de vi ſuperſtite vel deſtructa Magnetica: </
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<
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xml:space
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Magnetis, Borracis ana ℨiij. </
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xml:space
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">optime miſtas impoſui crucibulo, quod
<
lb
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per 3 horas Igni expoſitum validiſſimo, exhibuit modo maſſam ali-
<
lb
/>
quam vix cohærentem, quæ minabatur quaſi in ſolidam ſubſtan-
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lb
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tiam abire vellet, ſi modo plus fluidi admiſtum fuiſſet: </
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<
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xml:space
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">hæc attra-
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lb
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hebatur a Magnete adhuc ut ante, imo tota ſubſtantia attraheba-
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lb
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tur, æque Minium, Sal, quam Magnes: </
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<
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addendum eſſe, & </
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<
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">quia Arenæ triplo plus Minii eſt addendum, ut
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vitrum inde formetur; </
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<
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xml:space
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">addidi quoque maſſæ noſtræ tantundem Mi-
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nii, ut nunc eſſet ejus triplo major copia quam Magnetis, adjecta
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etiam fuit Borracis drachma: </
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<
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">hæc maſſa in crucibulo per trihorium
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ſummo Igni commiſſa, abiit in vitrum opacum fuſci coloris, ad-
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modum grave, quod fundi ducique poterat, ut vitrum ſolet; </
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<
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que homogeneum ubivis. </
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">Adeoque Magnes in vitrum ſic erat mu-
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tatus, ſummamque proinde operationem paſſus, quam unquam po-
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terit: </
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xml:space
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">[Cauſtici ſpeculi foco excepto] in qua ſi vim ſuam retinet,
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eam quidem ſemper retinebit.</
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<
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">Hoc vitrum itaque oblatum Verſorio, id æque manifeſto attra-
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xit, quam ante ullam perpeſſam operationem ab Igne: </
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<
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">Attraheba-
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tur a Magnete etiam haud aliter, ac ſi verus Magnes fuiſſet quam-
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obrem hoc vitrum in pulverem tritum a Magnete attrahebatur, ut
<
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inſtar barbæ ipſius polis adhæſerit: </
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<
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& </
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<
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">undiquaque ambiens partes Magnetis non ita impediit ejus vires,
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quam quidem parva Salis copia in præcedentibus proceſſibus, quod
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clarius per Experientiam, quam quidem ex ratione intelligitur, ſed
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plurima in Phyſicis ita comparata ſunt.</
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">Quum Antimonium ſolet ferè omnia metalla in Igne reddere vo-
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latilia, ea penetrando uſque in intimam medullam, in ſubtiliſſimas
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ſolvendo partes, & </
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