Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB I. CAP. XXI.
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ab hocce puncto ; </
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xml:space
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">vis ergo illa creſcit in ratione
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tiæ.</
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<
s
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xml:space
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<
s
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tur, figuram ovalem circa hocce punctum deſcribet, quæ,
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quando globus per ſpatium magnum non excurrit, ab Elli-
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pſi fere nihil differt, propter virium proportionem, & </
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<
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in eo caſu ad ſenſum in eodem plano movetur globus.</
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<
s
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echoid-s3978
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xml:space
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">Centrum Ellipſis eſt punctum in quo globus quando non
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projicitur quieſcit, in unaquaque revolutione bis ad illud
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globus accedit, & </
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<
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<
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xml:space
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globus ſuſpendatur ita, ut fere menſam quando quieſcit tangat,
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& </
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<
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">punctum cui tunc reſpondet in menſa notetur, Experi-
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mentum multo ſit magis ſenſibile; </
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<
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via cum creta in menſa notari poteſt.</
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<
s
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xml:space
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">Si vis juxta aliam rationem creſcat, curva in ſe non re-
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xml:space
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dit; </
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<
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13.</
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<
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xml:space
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">391.</
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globus ut ad diſtantiam majorem excurrat; </
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bit quæ ad Ovalem mobilem referri poteſt; </
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<
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que revolutione quidem accedit ad centrum, & </
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recedit; </
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<
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">ſed ſitus punctorum, in quibus minime aut maxi-
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me diſtat, in ſingulis revolutionibus mutatur, & </
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andem partem verſus hæc puncta feruntur, horumque motus
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cum globi motu conſpirat.</
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<
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<
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<
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quitur, nullâ vi centrali, ad æquales diſtantias æqualiter
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agenti, curvam poſſe deſcribi in ſe redeuntem & </
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cam, id eſt cujus centrum cum centro virium non coincidit,
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præter Ellipſin, in cujus focorum altero centrum virium da-
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tur; </
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<
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verſam quadrati diſtantiæ</
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">Circulum autem, cujus centrum cum centro virium coin-
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cidit, poſſe deſcribi vi juxta rationem quamcunque creſcen-
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tem aut decreſcentem, ſi modo ad diſtantias æquales æqua-
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liter agat, facile patet.</
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