Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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*DE* S*TATICÆ ELEMENTIS*.
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deto, ſub duplum æquilibris ponderis ejuſdĕ
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columnæ, ſublatoq́ue triangulo A B C, co-
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lumna D E quieſcat in H, ut hîc vides. </
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<
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cauſas jam nunc cõmem oratas, quemadmo-
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dum T I ad IV: </
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tantũ quando I V perpĕdicularis eſt & </
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<
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ad axem F G, verum etiam quando contin-
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gĕter obliqua. </
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<
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taq; </
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fectario clarum ſatis ac manifeſtum eſſet.</
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">8 Confectario proportio declarata fuit, ubi I mobile punctum ſupra H fuir
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punctum fixum, & </
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inclinata: </
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">eadem proportio in alio quovis ſitu demonſtranda eſt, & </
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quidem in illis, ubi mobile punctum infra fixum eſt, lineaq́ue obliquè extol-
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lens à firmo inclinata eſt. </
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">& </
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">A B columna eſto, ejusq́ue axis C D, punctum firmum E, mobile vero F,
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pondus obliquè extollens G, cujus
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obliqua linea FH, FI verò linea re-
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ctè attollens, cujus rectum pondus K.
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lis eſto A B columnæ, ejusq́ue axis
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N O, punctum firmum E, mobile F,
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ut E N æquetur E D, E F verò E P,
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pondus obliquè extollens Q æquale
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G, cujus linea obliqua ſit parallela ad
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F H: </
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<
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">pondus rectè extollens S æqua-
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le ponderi K, & </
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addantur, fiantq́ue una columna AM, cujus centrum gravitatis erit E, ex theſi-
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Ponderibus K, G, S, Q, amotis, columna A M quemvis datũ ſitum ſervabit
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in E puncto, per 7 propoſit. </
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bris. </
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ſimili ſitu appendamus, Q & </
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cjuſdem potentiæ ſunt, ideoq́ue quantum potentiæ eſt ponderi Q in L M
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columnam, tantundem quoque & </
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eſt, in ſitu ſuo retinere A B, per 6 confect. </
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">eadem igitur & </
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Conſimiliter eadem potentia K eſt in A B, eadem igitur S fuerit in L M. </
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Quemadmodum itaque IF ad FH ita K ad G per 8 conſectar. </
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æquatur IF, & </
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ponderi G: </
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ut diximus, non minus conſtans eſt in exemplis, ubi mobile punctum P in-
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fra E firmum eſt, quam ubi ſupra, ubiq́ue linea P R rectè extollens à latere
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firmi puncti E declinat, quam ubiſupra eſt, & </
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firmum punctum verſus inclinat.</
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