Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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*DE* H*YDROSTATICES ELEMENTIS*.
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<
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xml:space
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<
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xml:space
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">Quamvis tribus diagrammatis {γρ}αμμικῶς theorematis hujus veritatem evi-
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cerimus atque iſta via rationes & </
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<
s
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xml:space
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">cauſæ plenius uberiuſque pateſcant, uberta-
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tem tamen iſtam arithmetico calculo 4 hoc exemplo fœcundiorem efficere pla-
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cuit. </
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<
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xml:space
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zonti perpendiculare eſto, cujus ſupremum labrum A C pedalis longitudinis
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ſit in ſummitate aquæ A C F G, ſitq́ue altitudo A E item pedalis; </
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<
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xml:space
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gitudo A B pro libitu exporrigatur.</
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<
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A C D E annixum dimidię aqueæ columnæ,
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baſe iſti fundo, altitudine perpendiculari A E
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æquali æquari demonſtrator. </
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<
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">At cum columna
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iſta hîc cubus ſit pedalis, demonſtrandum erit
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fundo A C D E incumbere pondus cubici pe-
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dis dimidium.</
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<
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">P*RAEPARATIO*. </
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xml:space
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">Tres parallelę H I, K L, M N, contra A C æquali diſtan-
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tia rectam A E quadripartitò dividant.</
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</
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<
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ſtum eſt fundo A I plus inſidere quam o, nam ſi iſtiuſmodi fundum
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horizonti effet parallelum nihil ſeu o ipſi inſideret, at nunc cùm infra conſiſtat
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plus nihilo ſeu o ipſi incumbit: </
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<
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xml:space
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">Et tamen pondus illud citra {1/16} pedis eſt, cum
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enim ad horizontem parallelum agitur per H I tantò urgetur pondere: </
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cum in hâc theſi ſuperiori loco conſiſtat, minus ſuſtinet quam pedis cubici {1/16}.
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</
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<
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xml:space
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">ſimili ratione efficitur in fundo H L plus inſidere quàm {1/16}, minusq́ue {2/16}: </
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<
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fundo K N plus {2/16}, minus autem {3/16}: </
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<
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xml:space
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">denique fundo M D plus {3/16}, at mi-
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nus {4/16}. </
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<
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xml:space
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">Addita igitur quatuor pondera (ſi o huc annumeres) in ſingulis termi-
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nis priora & </
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<
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">minora, hoc eſt, o, {1/16}. </
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<
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">{2/16}. </
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<
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">{3/16}, danttotum {6/16}: </
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<
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">item quatuor poſte-
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riora & </
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<
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">majora {1/16}, {2/16}, {3/16}, {4/16}, colligunt {10/16}. </
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">Quamobrem fundo A C D E inſi-
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detpondus quoddam majus quàm {6/16} pedis, at minus quàm {10/16}, interq́ue hos
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terminos pes dimidius medius conſiſtit, quem fundo A C D E inſidere de-
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monſtrare neceſſum eſt.</
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<
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">Cæterùm qua ratione tribus parallelis fundum quadrifariam diſſecuimus,
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eadem omninò via in partes quotlibet optatas dirimetur. </
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torum optatus numerus. </
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<
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">Iam ob cauſas ante expoſitas, decem priora in colla-
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tione & </
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<
s
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">minora pondera quæſingulis inſident fundis, uto, {1/100}, {2/100}, {3/100}, {4/100},
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{5/100}, {6/100}, {7/100}, {8/100}, {9/100}, collecta efficiunt ſummam {45/100}: </
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graviora ut {1/100}, {2/100}, {3/100}, {4/100}, {5/100}, {6/100}, {7/100}, {8/100}, {9/100}, {10/100}. </
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<
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">dant ſumman; </
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">{55/100}.
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</
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<
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xml:space
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">quamobrem fundo A C D E plus inſidet quàm {45/100} & </
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<
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">minus quàm {55/100}, qui
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termini utrimque à dimidio pede, propter quem demonſtratio inſtituitur, ab-
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ſunt pari intervallo. </
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<
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">Atqui quemadmodum hi proprius abſunt à pede dimidio
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prioribus illis, nam {45/100} differentia ab {1/2} minor eſt quàm {6/16}; </
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<
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differentia quam {10/16}: </
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<
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">ita in quo plura ſegmenta æqualia fundum A C D E par-
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titus eris, continuò magis magisq́ue ad ipſum dimidium pedem accedes.</
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<
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<
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">Quibus ritè intellectis, fingamus (ſi ſieri poſſit) fundo A C D E plus minusvé
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{1/1000} pondere dimidii pedis inſidere: </
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<
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">veritatem igitur, fundo in 1000 partis lineis
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parallelis ut ante diſtributo, ratione viaq́ue jam uſitata inquiramus. </
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antecedentes cauſas mille ponduſcula priora mille particulis inſidentia erunt
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O {1/1000000}, {2/1000000}, atque ita deinceps, ultimumq́; </
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