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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[Handwritten note 1]
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[Handwritten note 2]
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hilominus vim recepit geſtandi pondus 4 granorum.</
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<
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xml:space
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">Omnia hæc Experimenta clare probaverunt Magnetis vim non in-
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tremore partium conſiſtere, quum communicetur cum Ferro ipſum
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non attingente, aut ducto ſupra pannum tremores ſuſfocaturum; </
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<
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ad intervallum a Magnete inſigne fieri virtutis attrahentis commu-
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nicationem; </
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<
s
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">hæc indicant Magnetem medium in Atmoſphæra ſuarum
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virium, quæ ad notabilem diſtantiam diffunduntur, hærere.</
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<
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">Quoniam Experimenta cum prioribus cylindris aut parallelo-
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pipedis ferreis mihi non ſatisfecerant, confectæ fuerunt 6 laminæ
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rectangulæ, accurate æque craſſæ, quam proxime {1/100} pollic.
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</
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<
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">erant quoque æque longæ, nempe 4 pollicum, latitudi-
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ne erant 1, 2, 3, 4, 5, 6 linearum: </
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<
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xml:space
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">hæ omnes ter ſuper eo-
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dem polo Magnetis cum eadem vi applicatæ, æque celeriter ductæ
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fuerunt, ut æquabiliter vi Magneticâ imprægnarentur: </
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<
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xml:space
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">tenuiſſima
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erat prima, quæ modo pondus 1 {1/4} grani ab una ſui extremitate ſu-
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ſpendit.</
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<
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<
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">Altera latitudinis duarum linearum geſtavit 10 {3/8} gran.</
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<
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xml:space
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">Tertia latitudinis 3 linearum geſtavit 7 {5/8} gran.</
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</
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<
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<
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xml:space
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">Quarta latitudinis 4 linearum tulit 2 grana.</
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</
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<
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<
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">Quinta latitudinis 5 linearum tulit 1 {1/2} gran.</
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</
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<
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<
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xml:space
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">Sexta latitudinis 6 linearum tulit 1 {1/10} gran.</
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<
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<
s
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xml:space
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">Quæ Experimenta etiam modo probant id, quod ſuperius innui-
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mus, Ferrum determinatæ latitudinis viribus attrahentibus maximis
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a Magnete imprægnari, alia autem magis minuſve lata ferramenta
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minori vi donari; </
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">præterea nulla proportio inter latitudines & </
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obſervatas datur conſtans.</
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<
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">Tandem explorandum erat, an Ferrum altero longius majo-
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ribus viribus a Magnete imbueretur. </
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<
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xml:space
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">Quamobrem lamina ferrea,
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ejuſdem craſſitiei cum 6 prioribus, 5 lineas lata, pollices 13 {1/4} lon-
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ga ſuper eodem Magnetis polo ter ducta fuit, uti ſuperiores; </
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<
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">hæc ab
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extremo geſtavit pondus ferreum 25 granorum: </
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<
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do eſſet 10 pollices longa, iterumque ter ducta ſuper eodem Ma-
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gnetis polo geſtavit 33 grana; </
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<
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">cum erat 9 pollicum ſuſtinuit modo
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19 gran. </
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">& </
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<
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ces geſtavit modo 1 {1/2} gran.</
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<
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">Ex hoc Experimento etiam conſtat poſito ejuſdem latitudinis & </
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