Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XIX.
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<
s
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xml:space
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">Dentur duo pendula, CP, cp, quorum longitudines ſint in-
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terſe, ut vires gravitatis quibus agitantur; </
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fig. 2.</
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excurrant, in punctis reſpondentibus gravitates eandem ſem-
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per habebunt rationem inter ſe, propter inclinationes æ-
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quales, & </
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<
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">quidem rationem arcuum percurrendorum, (quia
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arcus ſimiles ſunt ut pendulorum longitudines) qui ergo æ-
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qualibus temporibus percurrentur , id eſt, vibr ationes
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runt æ æquè diuturnæ.</
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<
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<
s
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xml:space
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">Si ad eandem longitudinem reducantur mutato pendulo
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c p cujus longitudo fiat cq, æqualis CP; </
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<
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">quadratum dura-
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tionis vibrationis penduli cq eſt ad quadratum durationisvi-
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brationis penduli cp, aut CP, ut longitudo cq, aut CP,
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ad cp ; </
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<
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">id eſt ut gravitas quæ in pendulum CP agit
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gravitatem quæ pendulum cq agitat. </
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<
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drata durationum vibrationum pendulorum æqualium, inver-
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sè ut gravitates in pendula agentes. </
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<
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durationum vibrationum ſunt directè ut pendulorum longi-
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tudines , & </
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<
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">inversè ut gravitates quibus moventur ,
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iam gravitates hæ ſunt directè ut longitudines , & </
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* 300.</
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ut quadrata durationum vibrationum .</
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</
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">SCHOLIUM I.</
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extendi ABD, & </
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<
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">corpus in hac linea recta moveri juxta legem penduli o-
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fig. 7.</
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ſcillati in cycloïde, id eſt dari preſſionem in corpusagentem, quæ ſequatur ratio-
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nem diſtantiæ corporis a puncto medioB, & </
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pus quieſcens; </
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<
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">centro B, radio BA, deſcribatur Semicirculus ALD, quitempus
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repræſentat, in quo corpus movetur ab A ad D; </
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<
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quæcunque lineæ AD deſcribuntur, erectis ad hanc perpendicularibus, de-
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terminantur, arcus HI tempus in quo FG, & </
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percurruntur, deſignant: </
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ſunt ipſis perpendicularibus FH, GI.</
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<
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vetur ita, ut temporibus, quæ ſunt ut arcus AH, HI, percurrat portiones
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AF, FG, & </
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lum ALD. </
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<
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les diviſum, momenta minima æqualia temporis deſignantes, quales ſunt
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H b & </
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poribus æqualibus lineæ F f & </
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