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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419405DE MAGNITUDINE TERRÆ.
Problema XVI.
Triangulum E S R. Leida, Gouda, Dordracum.
11
Datur per Probl. X V. diſtantia inter Leidam & \\ Goudam # 5918, 9, 7.
Ex obſervatis autem datur angulus R E S # 25 gr. 49?.
Angulus S R E # 25 gr. 49?.
Angulus R S E # 128 gr. 22?.
Unde per doctrinam Triangulorum eruitur diſtantia \\ inter Goudam & Dordracum # 5918, 9. 7.
Inter Leidam & Dordracum # 10663, 7.
Problema XVII.
Triangulum E A R, Leida, Haga, Dordracum.
22
Per Problema XIII datur diſtantia inter Hagam & \\ Leidam # 4118, 0, 7.
Ex obſervatis autem angulus E A R # 85 gr. 51?.
Angulus A E R # 71 gr. 31?.
Angulus A R E # 22 gr. 38?.
Unde latus E R diſtantia inter Dordracum & Lei- \\ dam # 10672, 7.
Quæ major eſt quam inventa in problemate XVI, quare angulus
E A R major fuit obſervatus, quam revera eſt, poſitâ priori menſurâ
bonâ:
error irrepere in obſervationem Snellii potuit, quia Dordraco
Hagam non conſpicere ipſi licuit.
33
Eruitur vero diſtantia inter Hagam & Dordracum # 10148, 8.
Problema XVIII.
Triangulum A E F, Haga, Leida, Rotterodamum.
44
Per Problema XIII. Datur diſtantia inter Hagam Lei- \\ damque E A # 4118, 0, 7.
Ex obſervatis angulus E A F # 90 gr. 18?.

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