Musschenbroek, Petrus van
,
Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae
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DE MAGNITUDINE TERRÆ.
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belli reliquias oſtentaret, turris, inquam, ejus pagi ſit m. </
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xml:space
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à turri curiæ Leidenſis ita in meridiem vergit, ut pauculis gradi-
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xml:space
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xml:space
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ginti ſex Rhynlandicis perticis & </
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xml:space
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<
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xml:space
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rum ut omnem ambiguitatem tollam, & </
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<
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xml:space
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plicem, qua formula paſſim in hoc calculo uſus ſim prius indicabo.
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</
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<
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xml:space
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<
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xml:space
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nem uſurpavi. </
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<
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xml:space
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viarum dimenſione & </
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xml:space
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tica, ipſi virgam vocant, een Roede, duodecim pedes longa, quas
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duas orgyas veteres dicerent, eandem & </
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<
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xml:space
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tinemus, ſed in partes tantum decem tributam. </
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<
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xml:space
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in uncias duodecim rurſum ſubdividunt; </
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xml:space
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tum in partes decem, ita ut illis tota pertica ſit unciarum centum
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quatuor & </
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<
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xml:space
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centum. </
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<
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xml:id
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xml:space
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">Ut noſtri pedis in hoc calculo ad Rhynlandicum ratio ſit
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ut 6 ad 5. </
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xml:space
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">eadem ſcilicet, quæ Alexandrini aut Philetærei ad Roma-
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num: </
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<
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xml:space
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<
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xml:space
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">?@ Calamus, ha-
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bet Philetæreos pedes decem, Italicos duodecim. </
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<
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xml:space
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<
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pes decumanus Alexandrino æqualis ſit, cum Rhynlandicus Ro-
<
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mano par ſit. </
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>
<
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xml:space
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">Atque hic tamen à conſueta appellatione non rece-
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dimus, ut {1/10} Calami ſeu perticæ pedem, & </
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<
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xml:space
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vocemus. </
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<
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xml:space
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">Ea autem numeratione & </
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<
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xml:space
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">enuntiatione hoc aſſequimur,
<
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ut ſolis integris numeris, non intercurrentibus partium particulis,
<
lb
/>
omnis calculus abſolvatur, neque conſuetam integrorum numera-
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lb
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tionem quidquam turbent. </
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<
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xml:space
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">Exemplum, ſi quæratur 1575 digiti in
<
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longum exporrecti quot ſint decempedæ? </
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<
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xml:space
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">Cum in pertica vel no-
<
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ſtra decempeda ſint digiti centum, efficientur 15 decempedæ no-
<
lb
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ſtræ, 75 digiti; </
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<
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xml:id
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xml:space
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">hi per decem diviſi, tot enim digiti pedem effici-
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/>
ciunt, dabunt pedes 7. </
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<
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">digitos 5. </
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>
<
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xml:space
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">itaque ſola diſtinctione omniæ
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iſta exprimentur, hoc modo 15, 7, 5. </
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<
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xml:id
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xml:space
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">Et contra idem numerus
<
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non interrupto ordine in digitos vertetur, hoc modo, 1575 digiti. </
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<
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xml:id
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xml:space
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<
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eodem modo intervallum ſtationum, quod diximus eſſe perticarum
<
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326 pedum 4, ſecundum iſtam menſuram decumanam expreſſi, &</
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