Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XXIX.
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f g, noteturque diviſio in lamina de ad quam extremitas
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g laminæ f g deſcendit. </
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<
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<
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librarum, duplicandum etiam eſt pondus, quo chorda infle-
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ctitur, ut deſcendat g ad eandem diviſionem, & </
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<
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eſt duarum unciarum; </
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<
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requiruntur, quando pondus P eſt ſex librarum.</
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<
s
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">Ex hoc Experimento ſequitur, pondus, quo certa quan-
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">675.</
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titate producitur fibra, in variis gradibus tenſionis fibræ,
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eandem cum tenſione rationem ſequi: </
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fibræ ejuſdem generis, longitudinis, & </
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tenſiones ſunt ut 1. </
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proportione æqualiter producunt illas fibras.</
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">Ejuſdem fibræ productiones minimæ ſunt inter ſe quam
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proxime ut vires quibus fibræ producuntur. </
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</
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">fibra tenſa pondere centum unciarum, ſi ſeparatim
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producatur viribus unius unciæ, duarum unciarum, & </
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um unciarum, productiones erunt quam proxime ut unum,
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duo, & </
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<
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æqualiter producit fibram: </
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">unciarum, quibus in ſingulis caſibus, quando
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uncia ſuperadditur, tenditur fibra, parum inter ſe diffe-
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runt.</
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<
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cari poteſt, & </
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<
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fig. 3.</
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ſitus A c B, A c B, & </
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inflexione ſagitta non ſit quartæ partis unius pollicis, po-
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ſitâ chordæ longitudine duorum pedum cum ſemiſſe; </
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iſtis caſibus productiones chordæ ſunt admodum parvæ, er-
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go in ratione virium, a quibus oriuntur , & </
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ſignant; </
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& </
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ſingulæ ſuperant lineam cD, quantitate, qua in ſingulis inflexio-
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nibus fibra fuit producta, exprimunt vires integras, quibus in
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ſingulis caſibus fibra tenditur. </
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gradus, & </
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recta ipſic C parallela haberi poteſt, & </
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