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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tiſſimi hujus Philoſophi Experimenta adjungere, quia facta ſunt
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cum Magnete & </
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diverſum hoc eſt penitus examen a noſtro, cum uſus ego tantum
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fuerim vel duobus Magnetibus, vel Magnete & </
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ſidente vim a Magnete ſibi communicatam: </
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ſorias impoſitas cuſpidibus, quarum una erat 4 {1/2} pollices, altera 4 pedes
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longa, atque Magnetem ſphæricum diametri 2 {8/10} pollicum; </
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<
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lum Auſtralem ſemper oppoſuit acuum cuſpidibus Borealibus, admo-
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vendo Magnetem verſus acum ita, ut hæc ſemper cum linea directrice
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Magnetis conſtitueret angulum rectum: </
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">tum chordas arcuum men-
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ſuravit, quibus acus declinabat â naturali directione, quarum lon-
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gitudines ſumebat pro iis quantitatibus, quæ exprimerent vires attra-
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ctrices, loco Chordarum Sinus poſuit, quia hi ſunt dimidia Chorda-
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rum, Tabulamque obſervationum dedit ſequentem.</
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Diſtantia \\ in pollic. # Gradus \\ declinat. # Sinus dimidiorum \\ arcuum.
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3 # 0 # 0
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6 # 0 # 0
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6 {1/2} # 90 # 7071
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9 # 27 # 2334
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12 # 13 # 1132
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15 # 9 {1/4} # 848
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18 # 6 {3/4} # 588
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21 # 4 {1/2} # 392
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24 # 3 # 262
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27 # 2 # 174
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30 # 1 {5/6} # 160
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33 # 1 {1/2} # 131
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36 # 1 {1/4} # 109
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39 # 0 {5/6} # 73
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42 # 0 {3/4} # 65
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45 # {2/3} # 58
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48 # {1/2} # 44
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