Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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4 L*IBER* S*TATICÆ*
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<
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xml:space
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">Similiter in cæteris, nam ad numerum qui ipſi 7 inſcribatur inveniendum,
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addes nomen 9 ad 7, totus 16 eſt nomen novum, cuiſuperſcribes 14 à 9 & </
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<
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ſunt numerus nomenq́ue {5/9}) compoſitum. </
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<
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7, ut infra vides:</
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xml:space
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<
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<
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xml:space
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">Qua ratione in cæteris continuata, numeros ipſis 9 & </
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neris. </
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<
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xml:space
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<
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<
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">Quibus intellectis, ſi quæratur quo punctum L aſcendat fundo in quinque
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ęquas partes diſtributo. </
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">Sumito numerum quinto loco, hoceſt ipſi 9 inſcriptum
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is erit {30/25} ſeu in minimis terminis {6/5}, hic indicabit L F talis fundi quinque-partiti
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fore {6/5} menſuræ cognominis partibus, in quas fundum tributũ erit. </
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norem eſſe quam {1/3} E F, punctumq́ue ejus ſummũ L hærere infra K demõſtra-
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bitur hoc modo. </
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<
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">{6/5} partis unius in quas fundũ ſecatur hoc eſt {6/5} {6/5} ſunt totius EF
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{6/25} quas {1/3} excedit {7/75} ejuſdem. </
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<
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conſiſtet. </
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menſuram ad ſui {6/5} ſumma erit {11
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/9}, quæ ſunt {11/25} totius E F & </
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ejuſdem, nam de {11/28
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} deducta {1/3} relinquitur {8/75}, tantumq́ue M punctum ſupra K
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conſiſtet, punctumq́ue hoc ſupernate M cadet ab K {1
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/75} diſtantius quam in-
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fernate L. </
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<
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">ut cum A B C D ſecabitur in partes
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40, F L deprehen detur {20550/1600} unius menſuræ hoc eſt unius quadrageſimæ ipſius
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E F. </
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nitè quoque vicinior invenietur, quæ tamen nunquam eo pertingat. </
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<
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neceſſitas ſuperiore exemplo γραμμικως demonſtrata eſt. </
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hujus noſtri, is facilè animadvertet, qui modum 2 propoſ. </
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horizontem inclinati, & </
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latus horizonti parallelum intra aquam abditum recta & </
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ipſum & </
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in iſto fundo collecti partem dictæ rectæ inter ſui ſemiſ-
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ſem & </
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trienti inferiori vicina ad reliquam ſit, quemadmodum per-
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pendicularis à ſupero fundi latere uſque ad aquæ ſuperfi-
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ciem ſummam, ad ſemiſſem perpendicularis indidem de-
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miſſæ in planum per imum latus horizonti parallelum.</
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rum latus A B intra aquam E F deliteſcens horizonti parallela eſt, unde G A
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perpendicularis eſt in ſuperam aquæ ſuperficiem, eademq́ue continuata deor-
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ſum in ſuperficiem per D C horizonti parallelam ſit A H, ſemiſſis A I, </
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