Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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421 - 450
451 - 480
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MATHEMATICA. LIB. I. CAP. XIII.
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pondus cunei, cochleæ g g, & </
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">lancis cum pondere impoſi-
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to) ſe habet ad ſummam ponderum P,P, ut baſis cunei
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ad ipſius altitudinem, æquilibrium datur, inter vim qua
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cylindri ſeparantur, & </
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<
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">illam qua ad ſe mutuo trahuntur.
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</
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<
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xml:space
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">Hoc exinde elicitur, quia agitatione minimâ cuneus eleva-
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tur aut deprimitur.</
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<
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xml:space
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">Magnam cum cuneo affinitatem habet cochlea. </
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<
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xml:space
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bus partibus conſtat.</
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<
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5.</
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<
s
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xml:space
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">Prima, quæ vocatur cochlea interior, eſt cylindrus ad for-
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xlink:label
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xml:space
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">208.</
note
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mam belicis ſulcatus, ut AB.</
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<
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fig. 8.</
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">Secunda, quæ vocatur cochlea exterior, & </
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<
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<
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differt pro vario uſu Machinæ, eſt ſolidum cylindricè excava-
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tum, cujus ſuperficies concava eodem modo ſulcata eſt, ita ut bu-
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jus eminentiæ alterius cavitatibus congruant, ut DE.</
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</
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<
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<
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xml:space
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">Hæ duæ partes in ſe mutuo moveri poſſunt, quod in uſu
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hujus machinæ requiritur. </
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<
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xml:space
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">Inſervit præcipuè ad compri-
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menda corpora, quæ jungi & </
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hac enim Machinâ potentia minima quam arctiſſimé corpo-
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ra comprimit. </
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<
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xml:space
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">Poteſt etiam cochlea ad elevanda ponde-
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ra adaptari. </
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<
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xml:space
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">In unaquaque revolutione hujus machinæ, quie-
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ſcente parte una, altera protruditur ad diſtantiam æqualem in-
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tervallo duarum proximarum ſpiralium converſionum. </
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<
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xml:space
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tentia, quâ cochlea movetur, applicatur manubrio, aut ſcy-
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talæ & </
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<
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">potentia eſt ad compreſſionem, quam generat, ut
<
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">210.</
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prædicta diſtantia, inter duas proximas ſpiralium converſio-
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nes, ad peripheriam circulià puncto manubrii aut ſcytalæ,
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cui potentia applicatur, percurſi; </
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<
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xml:space
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no, quo reſiſtentia ſuperatur, percurſa, illam ad viam po-
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tentiæ rationem habet.</
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<
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<
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">Hic obſervandum eſt, quando potentia cum pondere æquè
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pollet in machinâ quacunque, ſi potentia parte quantumvis
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exiguâ augeatur, illam præpollere, machinâ omnium parti-
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um attritu carente; </
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<
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& </
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peraddi debet, quod ratiocinio mathematico determinari </
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