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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Maji. # 21. # primæ 50 # 2 # 41
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# # ultimæ 50 # 2 # 28
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# 23. # primæ 50 # 2 # 40
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# # ultimæ 50 # 2 # 27
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# 25. # primæ 50 # 2 # 41
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# # ultimæ 50 # 2 # 30
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# 27. # primæ 50 # 2 # 41
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# # ultimæ 50 # 2 # 28
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">Intuiti prima fronte hæc Experimenta ſuſpicaremur Aëris rarita-
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tem majorem minoremve variis diebus, plus minuſve reſiſtere oſcil-
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lanti Acui, & </
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<
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">ideo eam varia velocitate arcus ſuos abſolvere, ve-
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rum tanta raritatis, & </
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<
s
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xml:space
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">proinde reſiſtentiæ, differentia in aëre non
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obtinet horæ intervallo, ut inde in oſcillationibus adeo notabilis
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diverſitas oriatur, quæ obtinuit in Experimentis tertio Aprilis & </
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Vigeſimo Maji captis: </
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<
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xml:space
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">An inde non ſequitur vim Magnetis omni
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fere temporis minuto eſſe diverſam, nunc majorem, ſequenti mo-
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mento autem minorem abſque ordine ullo? </
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<
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xml:space
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">Hoc colligo ulterius ex
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aliis Experimentis, quum enim Acus primas oſcillationes 50 abſol-
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vit intra determinatum tempus, & </
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<
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ſed determinatum tempus; </
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<
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">an non deberet ſemper ultimas 50 vi-
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brationes deſcribere intra idem tempus, deſcriptis 50 primis in tem-
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poribus æqualibus, & </
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<
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">poſita vi Magnetica aliquamdiu conſtanti,
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verum ea perpetuo variante etiam ultimæ 50 vibrationes brevius
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longiuſve tempus poſtulabunt: </
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<
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">Ecce Vigeſimo Maji in duobus ul-
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timis tentaminibus, primæ 50 Vibrationes peractæ ſunt 2?</
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<
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<
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ultimæ 50 in medio tentamine abſolvebantur 2?</
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in poſtremo tentamine peragebantur 2?</
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<
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<
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tamina inſtituta Maji 21 & </
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<
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tæ ſunt 2?</
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<
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ultimæ in poſtremo tentamine 2?</
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<
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xml:space
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">. In hac ſententia me conſir-
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maverunt plurima alia Experimenta cum Magnete capta; </
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<
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Declinatio ope longæ Acus explorata, perpetuo mutatur, veluti
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ſupra in Exp. </
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<
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<
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<
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eſt eadem, licet uno die 10 tentamina inſtituantur; </
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<
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">quæ modo me-
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moratis addita obſervationibus, luce Meridiana clarius evincunt,
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perpetuis mutationibus vim Magneticam eſſe obnoxiam, ſive di-
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rectionem, ſive virium magnitudinem ſpectemus. </
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