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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ventio 18 propoſ. </
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<
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xml:space
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">inſtituitur) pondus I aquæ preſſui erit æquilibre, fundum
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A C D E (ſilabi poſſe fingas) eo ſtatu conſervans.</
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<
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<
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xml:space
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">Vel, ut idem adhuc clarius illuſtrem. </
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<
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xml:space
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">M N O P fundum eſto, ipſi A C D E
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æquale & </
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<
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">ſimile, lateribus M P, A C, M N, A E, homologis, cui inſidet ſolidum
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M N O P Q ponderitate & </
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<
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">magnitudine dimidiæ
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columnæ A C H D E æquale ipſiq́ue ſimile, ac
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recta Q O æqualis D H horizonti ad perpendi-
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culum normata inſiſtat. </
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<
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xml:space
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">Ajo, quemadmodum ſo-
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lidum M N O P Q baſin M N O P premit pon-
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deroſiùs verſus N O quam ad M P, quia iſtic
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corpus ipſum ſpiſſius graviuſq́ue ſit; </
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<
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xml:space
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">ita quoque
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aquam A B ponderoſiore validioreq́ preſſu con-
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niti contra E D quàm contra A C.</
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<
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<
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<
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">P*RÆPARATIO*. </
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">Dirimito latus A E in qua
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-
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tuor quadrantes, in R, S, T, unde parallelæ ſint
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R V, S X, T Y contra A C; </
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<
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">ſint item V Z, X α, Y β parallelæ contra D H,
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ſecentq́ue C H in γ, δ, ε, ut quælibet eductarum γ Z, δ α, ε β æquent rectam
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V γ; </
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<
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">tum ζ η per γ parallela contra C D interſecet X α in θ & </
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">V β in 1, ſi-
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militer Z κ per δ educta ſecet Y β in λ, ad extremum eodem ordine ducan-
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tur parallelæ α μ per ε, & </
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">Primùm fundo A C V R aliquod pondus incumbit, quia tuncſolum one-
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re vacaret ſi in aquæ ſuperficie ſumma conſiſteret; </
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<
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">at infra eſt; </
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ris preſſu vacat. </
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<
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">Secundò minore quàm A C ζ γ V R, aquei corporis pondere
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afficitur, etenim per 10 propoſ. </
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<
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">ſi horizonti æquidiſtaret iſtud pondus ſuſtine-
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ret, at nunc altiorem locum obtinet, minus igitur ſuſtinet. </
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<
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">Conſimiliter fundo
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R V X S majus quoddam pondus incumbit quàm corporis A C ζ γ V R; </
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nim ſi fundum iſtud per R V horizonti æquidiſtaret iſtic per 10 propoſ. </
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<
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tum corpus ſuſtineret: </
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pondus corporis A C ζ γ V S hoceſt ſibi æqualis R V γ θ X S. </
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nus ipſi inſidet quam corpus A C ζ θ X S, quia per 10 propof. </
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<
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dum id, per S X ad horizontis paralleliſmum eductum eſſe; </
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dum R V X S ſublimius ſit, minus ponderis perpetitur quàm A C ζ θ X S, hoc
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eſt, ipſi æquale R V Z δ X S. </
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<
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<
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">plano per
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X S horizonti parallelo, cõcludes fundo S X Y T plus ponderis inſidere quàm
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corporis A C ζ θ X S, hoc eſt ipſi æqualis S X δ λ Y T; </
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<
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pter eandem 10 prop. </
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<
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">planũ per T Y horizonti parallelũ) quam A C ζ. </
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hoc eſt quam ipſi æquale S X α ε Y T. </
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</
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">plano per T Y horizonti parallelo, evincesfundo T Y D E inſidere pondus
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majus corpore A C ζ. </
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<
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dem 10 propoſ. </
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<
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xml:space
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">planum per E D horizonti parallelum) minus corpore
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A C ζ η D E hoc eſt ipſo T Y β H D E. </
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<
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">Iam autem cum his demonſtrationi-
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bus effectum ſit fundo A C V R aliquod pondus inſidere neque vacare omni-
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no, fundo R V X S plus corpore R V γ θ X S; </
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<
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pore S X δ λ Y T, ultimùm fundo T Y D E plus corpore T Y ε μ D E, toti
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quoque fundo A C D E plus inſidet quàm pondus omnium iſtorum corpo-
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rum, quæ addita cõſtituunt corpus R V γ θ δ λ ε μ D E in dimidiam columnam
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inſcriptum. </
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uſerimus fundo A C V </
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