Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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operæ pretium ſit. </
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<
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>Latus vnum Quadran
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tis ita duplico, vt iam perpendiculum non
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ex circuli centro, ſed ab extremâ diametro
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pendeat, & obſeruationem inſtituo: hinc
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enim ſæpiùs fit, vt ſilum ſericum crudum,
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ex quo pilula plumbea ſuſpenditur, minùs
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obliquè lineam minutorum ſecet, quàm ſi
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ex centro penderet: Et quoniam angulus ad
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peripheriam ſubduplus eſt anguli ad cen
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trum, notæ verò graduum & minutorum̨
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Quadrantis limbo appoſitæ indicant angulos
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ad centrum, angulus à perpendiculo nota
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tus, ex. gr. 1. 45 1/2, bifariam diuiditur, &
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quæſitus angulus eſt, gr. o. m. 52. ſec. 45.
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Quare ſi qua labes obſeruationi adhæreat,
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pauculis ſcrupulis ſecundis definitur. </
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Merſ.
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<
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> Dari id quidem facilè poteſt ſy
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derum obſeruatori; in tantâ nimirum diſtan
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tiâ ipſius organi magnitudo, quantacunque
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demùm illa ſit, planè euaneſcit; ac proinde
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iſta, vt ita dicam, virtualis duplicatio Qua
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drantis nihil officit. </
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<
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>At verò telluris ma
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gnitudinem indaganti ex radio optico, res
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non ita in plano eſt: ſi enim oculum centro
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Quadrantis admoueas ita, vt latus alterum
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inſtrumenti congruat lineæ visûs, reliquum
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verò latus fuerit, vt dicebas, duplicatum;
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angulus à perpendiculo & lineâ visûs ex cen</
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