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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<
s
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xml:space
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">Auzutus opinabatur materiam fluere per Terram ad axin pa-
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rallelo motu, fluxum tamen continuo immutari ab alterationibus,
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quas arte & </
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<
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">opera Terræ inducimus, eam excavando hic, alibi
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accumulando & </
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<
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<
s
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<
s
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xml:space
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">idem fieri a naturalibus cor-
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roſionibus & </
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<
s
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xml:space
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">excavationibus, tum a metallorum generatione: </
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<
s
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xml:space
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">Verum
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an tam exiguæ mutationes, quas foſſores Terræ inferunt, pote-
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runt tantam varietatem, & </
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>
<
s
xml:id
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echoid-s5166
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xml:space
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">tam conſtantem inducere Declinationi
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Magnetis? </
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<
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xml:space
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">Quomodo Magnes ſtationarius explicabitur, qui per
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4 ſe ſequentes annos a 1720 ad 1725 eadem directione actus
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fuit? </
s
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<
s
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xml:space
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">An toto hoc tempore foſſores metallorum per univerſum
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terrarum orbem quieverunt? </
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<
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xml:space
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">Quomodo retrogradus explicabitur
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Magnetis motus? </
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<
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<
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">propoſitam, nemo amplius amplectitur, nec fovet.</
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</
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<
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<
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">Sed ne tempus teramus in hypotheſibus enumerandis, ad ex-
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perimenta redeamus potius, quæ quamdiu ſtabit Phyſicæ honos,
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eadem permanebunt, & </
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<
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xml:space
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">firmam baſin ratiocinio ſemper ſtruent,
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quæcunque inveniatur cauſa directionis, aut quocunque modo
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comparata fuerit vis Magnetica.</
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xml:space
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">Declinatio-
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nem Acuum Magneticarum explicare ex effectibus, quos Magnes
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in ejuſmodi Acus edit, fingentes ideo Magnetes globoſos, ſive
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Terrellas, quia Terram Magnetem grandem habuerunt, in qua
<
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omnia phænomena modo majora fiunt, quorum exiguas imagines
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Magnes quoque conſpiciendas præberet: </
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runt Æquatorem, inter utrumque polum medium, & </
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quales in artificialibus ſpectamus globis; </
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<
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ligatur, ſit in Tab. </
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">A B C D Magnes Sphæricus, Acus
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ſit G H, per cujus centrum gravitatis I ducatur recta E K ex cen-
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tro Magnetis, atque in hanc perpendicularis M N, repræſentans
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horizontem, quæ ſit parallela Tangenti punctum L, tum menſuretur
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angulus M I G, qui vocatur Inclinationis, menſuretur diſtantia pun-
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cti L a polo A, quo facto habetur Inclinatio Acus in determinata di-
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ſtantia â polo Magnetis: </
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ſitam.</
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