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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& </
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<
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">neque gradus hicce tenſionis notus eſt; </
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<
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">illud conſtat,
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tenſionem fibrarum, quæ Elaſticitatem conſtituit, certis
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limitibus terminari.</
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<
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<
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xml:space
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">Ex hiſce patet differentia corporum elaſticorum & </
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elaſticorum; </
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<
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">quare corpus elaſticum Elaſticitatem amit tit,
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& </
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<
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">quomodo Elaſticitate deſtitutum proprietatem hanc acqui-
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rit. </
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<
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">Lamina metallica, repetitis mallei ictibus, quibus fibræ
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tenduntur, fit elaſtica, calefacta vim hanc amittit, dum vi
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ignis ſitus partium turbatur.</
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<
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<
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">Inter limites tenſionis, quibus elaſticitas terminatur, pro
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vario tenſionis gradu, vis diverſa requiritur, ad chordam
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certa quantítate producendam; </
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<
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">quænam hic proportio lo-
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cum habeat Experimentis determinari debet, quæ, ut jam
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dictum, cum chordis metallicis inſtituenda ſunt. </
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<
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ro hæ chordæ vix ſenſibiliter producantur, directe produ-
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ctionum proportiones menſurari nequeunt; </
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<
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hæ determinantur.</
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">Sit chorda horizontalis AB, certa vi tenſa; </
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<
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fig. 2.</
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mitates in A & </
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penſo inflectatur chorda, ut ſitum ACB acquirat.</
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<
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<
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">Linea ut C c a puncto medio chordæ poſt inflexionem, ad
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">672.</
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punctum medium in ſitu naturali, vocatur chordæ ſagit-
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ta.</
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<
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">Inflexione dimidia pars chordæ producta fuit quantita-
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te C e, quæ quantitas cum ſagitta C c certam relationem
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habet.</
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<
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<
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">Pondus etiam, quo chorda inflectitur, certam cum vi,
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qua fibra producitur, id eſt, per BC trahitur, relationem
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habet; </
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">& </
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<
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">ita in variis Experimentis ex comparationibus ſa-
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gittarum, & </
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<
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ductionum proportiones determinari poſſunt, ut ſequentibus
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Experimentis patebit.</
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