Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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*DE* S*PARTOSTATICA.*
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diſtendatur concludes. </
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<
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xml:space
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">ac pari ratione quo pondere reliquæ C D, C E diſti-
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neantur cognoſces.</
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<
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xml:space
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">Præterea ſi hæ retinaculorum lineæ in alias inſuper lineas diducantur, pon-
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dus quo ipſarum unaquæque diſtenditur, conſimiliter 9 conſectario conclu-
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detur.</
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<
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<
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xml:space
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">Si quatuor lineæ adidem punctum cohæreſcant, cujuſmodi antecedenti cõ-
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ſectario tres, propoſitio hæc unam certamq́ue determinationem non habet.
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</
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<
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xml:space
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">Sic A, B, C, D tanquam ſuprema linearum, è quibus pondus dependet,
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puncta intelligantor. </
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<
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xml:space
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">lam pendula ejus diameter vel incidet in rectam A D, vel
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extra ipſam intra trian gulum A D B, vel intra A D C (fieri enim non poteſt ut in
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ambitu quadranguli A B C D cadat, nedum extra) ſi incidat in A D, conſtat
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rectas ad B & </
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<
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xml:space
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">C pertingentes, potentiam quâ iſtæ ſub A & </
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<
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">D diſtenduntur
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quiddam allevare; </
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<
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xml:space
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">ſed cùm triangulũ dua-
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rum iſtarum linearum quæ ſub A, B, con-
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ſiſtunt & </
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<
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">tertiæ A D, nullam admittat mu-
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tationem varietatemvé, diverſę & </
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<
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xml:space
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ces potĕtiæ, ad C & </
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<
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">B adjungi poſſunt quę
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linearũ ſub A, D diſtenſionem immutent,
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manente tamen eâdĕ datæ formæ diſpoſi-
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tione, adeò ut certa ſingularũ partium de-
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terminatio nulla hic inveniri poſſit Cumautem pendula gravitatis diameter in
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E intra triangulum A D B cadet, tum quarta C à mutatione ſitus ponderum
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quæ ad A, B, C pertinent planè erit immunis. </
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<
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xml:space
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">ex quibus efficitur propoſitio-
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nem hujuſmodinullam partium ratam determinationem admittere.</
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<
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xml:space
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">Advertendum autem inſuper, cùm quatuor lineæ certam aliquam determi-
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nationem reſpuant, multò firmioriratione complurium linearum concluſio-
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nem incertam eſſe. </
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<
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">Similiq́ue ratione, cum 9 conſectario demonſtratum ſit,
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tres lineas in eodem plano nullam certam cõcluſionem habere, etiam quatuor,
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aliasq́ue plures longè minùs determinatione aliqua certa circumſcribi.</
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">Corpus etiam modo ab 11 conſectario diverſo è tribus lineis depĕdere poſſe,
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cùm ſcilicet tribus diſtantibus locis ipſæ corpori affigentur, ut continuatæ ta-
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men in eodem puncto non concurrant; </
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<
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<
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<
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tantum lineis ſuſpendantur neceſſariò cõtingit. </
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<
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iſtarum unicuique debitum, nondum etiam, dum hæctypis excuderentur, aſſe-
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cutus eram: </
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<
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tur, id temporis proceſſu fiet palam.</
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<
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">Ponderis igitur ab unâlineâ ſuſpenſi, ex qua deinde duæ treſvé aliæ in partes
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diverſas diſtractæ exiſtant, ratio hujuſmodi fuit; </
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<
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rum triumvé itidem linearum, eidem ponderi affixarum & </
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<
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inq́ue idem pendulæ gravitatis diametri punctum incurrentium, in procinctu
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erunt. </
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<
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">enimverò A B pondus eſto, de duabus lineis D C, E C ſuſpenſum, inq́
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C puncto concurrunto, pendulaq́ue diameter F C. </
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<
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