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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<
emph
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XVI.</
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Datur per Probl. X V. diſtantia inter Leidam & \\ Goudam # 5918, 9, 7.
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Ex obſervatis autem datur angulus R E S # 25 gr. 49?.
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Angulus S R E # 25 gr. 49?.
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Angulus R S E # 128 gr. 22?.
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Unde per doctrinam Triangulorum eruitur diſtantia \\ inter Goudam & Dordracum # 5918, 9. 7.
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Inter Leidam & Dordracum # 10663, 7.
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XVII.</
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Per Problema XIII datur diſtantia inter Hagam & \\ Leidam # 4118, 0, 7.
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Ex obſervatis autem angulus E A R # 85 gr. 51?.
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Angulus A E R # 71 gr. 31?.
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Angulus A R E # 22 gr. 38?.
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Unde latus E R diſtantia inter Dordracum & Lei- \\ dam # 10672, 7.
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s
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">Quæ major eſt quam inventa in problemate XVI, quare angulus
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E A R major fuit obſervatus, quam revera eſt, poſitâ priori menſurâ
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bonâ: </
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">error irrepere in obſervationem Snellii potuit, quia Dordraco
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Hagam non conſpicere ipſi licuit.</
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Eruitur vero diſtantia inter Hagam & Dordracum # 10148, 8.
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<
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XVIII.</
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Per Problema XIII. Datur diſtantia inter Hagam Lei- \\ damque E A # 4118, 0, 7.
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Ex obſervatis angulus E A F # 90 gr. 18?.
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