Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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*3 LIBER STATICÆ*
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<
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xml:space
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">RATIO VERSATIONVM MANVBRII
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AD AXEM.</
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xml:space
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">QVia manubrum L M N ter rotatum ſemel circumagit tympanum F, at no-
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vies ſemel in orbem aget H, & </
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<
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xml:space
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">27 tympanum K, hinc 162 circumductum
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convertet ipſum T hoc eſt axem S. </
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xml:space
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">Eodemq́ue modo manubrium L M N
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affixum ad F id tympanum 54 circumducendum erit ut axis S ſemel converta-
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tur. </
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<
s
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xml:space
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">ad H 18, K ſexies, T autem toties in orbem vertitur quoties ipſemet axis S.
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</
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<
s
xml:id
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xml:space
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">Cum autem manubrium altius inſeres quam in D, verbi gratiâ in K, ne infe-
<
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riora tympana, quæ difficultatem operi inducunt, unà convertere ſit opus, pro-
<
lb
/>
ximè inferius quod in expoſito caſu eſt G loco ſuo depelles ne dentes ejus den-
<
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tibus I amplius implicentur, atque ita inferior machinæ pars univerſa immota
<
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conſiſtet.</
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<
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xml:space
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">RATIO POTENTIÆ MANVBRIVM VER-
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SANTIS AD PONDVS TRACTVM,
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QUALE EST NAVIS X.</
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<
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xml:space
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">CVm flexura LM ex hypotheſi pedem longa, octupla ſit aſteriſci C, etiam
<
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potentia quâ C agit in E æquivalens potentiæ impellentis manubrium
<
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/>
LM erit ut 8 ad I, eodemq́ue modo propter efficientiam H in F, ut 24 ad I
<
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/>
atque deinceps ab I in G, ut 72 ad I, denique à T in K ut 216 ad I. </
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<
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xml:space
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">Sed or-
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biculus T æquivalet axi S, (æquivalere dixi, reverâ enim diameter axis
<
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S eſt ſeſquipedalis, T autem bipedalis ex hypotheſi, ſed quia dentes aſte-
<
lb
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riſci T ſextupli ſunt ipſius K, etiam diameter ſextuplum peterit diametri K
<
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quæ propterea erit 3 digitorum, & </
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<
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xml:space
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">quiad T digitorum 18, ſive ſeſquipedalis,
<
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quemadmodum diameter axis S) quare pondus ab axe S rectà deſcendens
<
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eandem habebit rationem ad pondus ſitu ſibi æquipondium, ſeu potentiam
<
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æquivalentem in M N quam 216 ad I. </
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<
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xml:space
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">Ratiocinium hoc ab axe S deſcenden-
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do deorſum inire licebit, eodem modo quo ſurſum adſcendendo nunc nobis
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inſtitutum fuit.</
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<
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">Sedidem etiam hoc pacto explicari poterit. </
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">Cum manubrum M N 162 in
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orbem gyratum ſemel circumducat axem S, ut ſupra jam aſſertum eſt, & </
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xml:space
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tio diametri circuli à verſura manubrii M N deſcripti ad radium axis S ſit ſeſ-
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quitertia (namque LM ſcapus pedalis eſt, ſemidiameter autem axis S {3/4} pedis)
<
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/>
exporrecti ambitus 162 verſationum manubrii M N, ad ambitum circuli in
<
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axe S ſe habet ut 216 ad I, atque in iſta ratione quoque ſunt ſemidiametri 216
<
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iſtius circuli ad hujus circuli ſemidiametrum. </
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>
<
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xml:space
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">quare per I propoſ. </
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<
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">1 lib. </
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<
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xml:space
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iſtius ad pondus hujus rationem habebit eandem quam 216 ad I. </
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<
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xml:space
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">Vnde effici-
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tur ſi M N tantâ verſetur potentiâ quanta eſt 25 librarum deſcendendo, quæ
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nobis v. </
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<
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<
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">major ubi collibitum erit (quamvis
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enim longè infra viri vires ſubſiſtat expoſita potentia, ita tamen exempli gra-
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/>
tia ſumpſiſſe placuit) iſta inquam potentia æquivalebit, 5400 libris (nam 216
<
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ſumpta 25 hanc ſummam efficiunt) ab axerectà deorſum tendentibus. </
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<
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rò navis X ſit ſextupla ponderis ab axe S rectà dimiſſi, itaque X navis 32400
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librarum (quod pondus eſt 9 modiorum, ſi 3600 libras ſingulis modiis tribua-
<
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mus) æquiponderabit priori ponderi ſeu quod idem eſt potentiæ manubrium
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MN continuè verſantis.</
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