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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CORPORUM FIRMORUM.
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deſcriptorum D D D D comprehenderent, & </
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iret tum per foramina unci, tum per foramina Lignorum E E, vel
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F F. </
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<
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<
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uncis & </
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<
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">ſimul machinæ divulſoriæ applicatum, exhibet: </
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<
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hoc apparatu ad ipſa tentamina accedamus, quorum eventus miri-
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fice varius exigit, ut quodlibet Lignum ſeorſim adnotetur: </
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<
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">nihil
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omittere conatus fui, quod vel tantillum lucis afferre huic doctrinæ
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poſſet: </
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<
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">quem in finem etiam figuras lignorum fractorum depinxi, ex
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quibus apparet an Lignum longas feſtucas, cum frangitur, format, an
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nullas: </
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<
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">ut poſſet eligi pro pariete interno navium bellicarum, in
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quibus fervente prælio plures vulnerantur a feſtucis ligni milites, quam
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ab ipſis globis tormentariis; </
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<
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">Lignum, quod abſque feſtucis rumpitur,
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huic malo obviam ire poſſet: </
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<
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xml:space
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">ſed præterea depinxeram alios in fines, ut
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nempe quam clariſſime & </
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<
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">â primis fundamentis Cohærentias reſpe-
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ctivas explicarem, in quibus tantum difficultatis poſtea deprehendi,
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ut â plurimis ſubtilitatibus abſtinere huc uſque coactus fuerim.</
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">EXPERIMENTUM I.</
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">Lignum Tiliæ, cujus medium erat cylindricum, antequam rum-
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pebatur, aliquamdiu ſuſtinuit libras Amſtelodamenſes 720, ab iis
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tamen fractum fuit: </
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">ante rupturam elongata fuit pars cylindrica
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{2/100} pollicis, diameter interim contracta {1/100} pollic. </
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medio cum feſtucis aliquibus eminentibus, quas exhibet Tab. </
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">omnibus Experimentis pondus C ſta-
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teræ appenſum fuiſſe lentè ſecundum ejus longitudinem promotum,
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& </
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">aliquamdiu, fere per minutum horæ ad quamlibet diviſionem,
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a 10 ad 10 libras increſcentem, relictum, non enim rumpitur lignum
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uno ictu, ſed ſucceſſive fibræ ſolvuntur, & </
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<
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ſemper per aliquod tempus exſpectandum eſt, antequam pondus
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ſupra ſtateram promoveatur.</
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dum, applicatum Machinæ noſtræ divulſoriæ, ruptum fuit a </
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