Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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PHYSICES ELEMENTA
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Quod etiam ſequenti Experimento confirmatur.</
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<
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3.</
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bo, alter ex ebore; </
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<
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">filis ſuſpendantur, ut forment pendu-
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la æqualia; </
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<
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">vibrationes æquales, atque exiguæ utcunque
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inæquales, ſunt æquè diuturnæ.</
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<
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">Sæpe loco fili virga ferrea tenuis ſed rigida adhibetur, & </
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">296.</
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aliquan-do etiam pondera duo aut plura ei annectuntur, & </
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vocatur pendulum compoſitum; </
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<
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tæ locum non habent; </
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<
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tur, determinando in iis punctum, in quo ſi pondera forent
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juncta, vibrationes eſſent æquè diuturnæ cum vibrationibus
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penduli compoſiti, Hocce punctum vocatur centrum oſcil-
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lationis. </
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plicamus.</
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<
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ctum, aut potius axem, vibrari; </
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minari centrum oſcillationis.</
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<
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">Quando linea recta, qualis eſt filum ferreum, circa ex-
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tremitatum alteram vibratur, centrum oſcillationis diſtat a
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puncto ſuſpenſionis duabus partibus tertiis longitudinis fili.
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<
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4.</
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<
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">Lamina ferrea AB ita ſuſpenditur, ut circa extremita-
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tem A vibretur; </
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">pendulum ſimplex CP, cujus longitudo eſt
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fig. 6.</
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duarum partium tertiarum AB, eodem tempore cum iſta
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lamina dimittitur; </
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dem tempore peraguntur.</
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<
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">Vibrationes pendulorum, ut diximus, licet inæquales,
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ſunt æquè diuturnæ , & </
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ximi uſus eſt in horologiis, quibus motus æquabilis, pen-
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dulo adjuncto, communicatur.</
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<
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ubique terrarum æqualem eſſe, enotuit ex eo, quod vibra-
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tiones ejuſdem penduli, in diverſis regionibus, reſpectu
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temporis, inæquales repertæ ſunt; </
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ſitas per pendula menſuratur.</
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