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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DE MAGNITUDINE TERRÆ.
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<
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Per Problema VII. datur E V diſtantia inter Lei- \\ dam & Trajectum # 11584. # 0.
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Ex oblervatis autem angulus V E I # 77 gr. # 50 ſcr.
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Et angulus V I E # 67 gr. # 51 ſcr.
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Unde angulus E V I dabitur # 34 gr. # 19 ſcr.
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Atque inde latus I V diſtantia inter Trajectum & \\ Harlemum # 12226. # 1.
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Et E I diſtantia inter Leidam & Harlemum # 7051. # 1.
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s
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">Vides itaque diſtantiam Lcidæ & </
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">Harlemi in utroque triangulo
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quam proxime conſentire, quam vis alterum tot ambagibus ſit à no-
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bis circumductum. </
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<
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">Nam initio diſtantiam Leidæ & </
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">Noortwici non
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eramus ex ipſo fundamento dimenſi, quod tamen poſtmodum ad
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certiorem operis rationem oblatâ opportunitate hyberno tempore
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per glaciem commodiſſime abſolvimus, argumenti eſt ſatis omnia
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obſervandi munia à nobis legitime & </
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">quam accuratiſſime obita, ut
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in utram obſervationem inclinandum ſit vix conſtaret niſi in XIII.
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<
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">Problemate angulus Harlemenſis exilis eſſet, ſed ſtatio Leidæ & </
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Noortwici baſis per ſe prima. </
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">Contra in Trajecto, Leida, Harle-
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mo angulus Trajectenſis juſtæ quantitatis, utpote 34 gr. </
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ſtantia inter Leidam & </
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">Trajectum derivata quidem, ſed omnibus
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modis ſatis accurata. </
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<
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">Itaque quamvis nihil admodum interſit inter
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utrumque calculum diſſerentiæ maxime circa ſinem hunc verſantibus,
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iſto tamen noviſſimo potius utemur.</
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