Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XXIII.
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pollicis æquales ſunt. </
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xml:space
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& </
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<
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xml:space
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unius pollicis. </
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<
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xml:space
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">Ut firmetur cohæret cum prominentiis t, t
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quæ cochleis ad partem poſticam ligni K retinentur.</
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</
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<
s
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xml:space
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">Regulæ huic unci junguntur quatuor Y, V, V, Y, di-
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ſtantia inter medios V, V, eſt ſeſqui pollicis, hujuſque di-
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ſtantiæ punctum medium datur in plano, quod concipitur per-
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pendiculare ad ſuperficiem K & </
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<
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xml:space
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">per axem columnæ l tranſ-
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it; </
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<
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xml:space
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<
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<
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xml:space
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">Juxta regulam hanc SS tubuli duo quadrati moventur, qui
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ad libitum cochleis firmantur, & </
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<
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ftatim memoratis ſimiles, cohærent. </
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in extremitatibus regulæ foramina dantur f, f, f, æqualiter a
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ſe in vicem diſtantia, poſitis extremis a ſe mutuo remotis ſe-
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ptem pollicibus cum ſemiſſe,</
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<
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<
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fig. 3.</
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ſiderantur globi eburnei diametri ſeſqui pollicis ut A. </
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majorum globorum utimur tribus cylindris eburneis quorum
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diametri globorum diametris æquales ſunt. </
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<
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per axem repræſentatur in C; </
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lindri B pondus duplum eſt ponderis globi A ejuſdem dia-
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metri cum cylindro; </
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<
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tripla ſunt ponderum globorum.</
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<
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">In his cylindris cavendum ut axis dentis eburnei, ex
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quo formantur, perpendiculariter ſecet axem cylindri cir-
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citer in hujus medio. </
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cylindri, ſimul machinæ applicantur cavendum ut convexi-
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tas unius alterius planam ſuperficiem tangat.</
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<
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<
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<
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.
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fig. 4.</
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formantur cylindri, quorum duorum minorum ſectiones per
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axem exhibentur in D, reliquorum in E, & </
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<
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dimus, quia elaſticitate ſua in Experimentis non a-
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gunt</
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<
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<
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xml:space
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