Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Theorema
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10.
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Omnes gyrationum modi explicari, & demonſtrari poſſunt.
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<
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">Primò, vertitur baculus manu primo circa proprium axem, vt
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,
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quia inflectitur eodem modo manus & inferior brachij portio: </
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<
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">ſecundo
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circa alteram extremitatem quæ manu tenetur: tertio circa quodlibet
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aliud punctum, ratio petitur tùm à tali brachij motu, tùm ab eo modo,
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quo baculus tenetur, </
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<
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">Secundò, circumagitur funis vel funda; </
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">quia producitur maior im
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petus in extremitate remota circa centrum immobile; hinc circulus; </
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hinc quia extremitatis illius motus determinatur ſemper ad Tangentem,
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tenditur funis; ſed de funda infrà, cum de proiectione. </
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">Tertiò, multos alios gyros facimus, manu, brachio, collo, pede, toto
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denique corporis trunco; </
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<
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id
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">quot enim habemus articulos, tot motus cir
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cularis habemus centra; </
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>
<
s
id
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">hinc ſuæ apothecæ caput oſſis tam aptè inſe
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ritur, vt circa illam facilè moueatur; </
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<
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">exemplum habes in oculo, dum
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infra ſuam thecam voluitur; </
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<
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">ſed de tota corporis fabrica, quatenus con
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ducit ad motum, ſuo loco agemus; nec enim hi motus ad hunc tracta
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tum pertinent. </
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<
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">Quartò, hinc reuoca deflexionem illam iacti globi, de qua ſuprà, quæ
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familiaris eſt trunculorum ludo, item gyros globi, quem, vel inter duas
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volas circumagis, vel inter volam, & aliud planum, qui partim ad impul
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ſum, partim ad tractum pertinent; ſed neque hæc ſunt difficilia. </
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Scholium.
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<
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">Obſeruabis vix poſſe vno Theoremate compræhendi omnia phœno
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mena percuſſionis, cuius ſunt tria veluti prima genera, ſcilicet ictus, ca
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ſus, iactus: ictum appello illam percuſſionem, quæ infligitur pugno, ma
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nu, calce, cornu, vel quolibet organo, cum potentia motrice coniuncto,
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v.g. fuſte, ſaxo, flagello, &c. </
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>
<
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">caſus eſt percuſſio à corpore graui deorſum
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cadente inflicta; iactus denique eſt percuſſio, quæ aliquam emiſſionem,
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ſeu vibrationem ſupponit, lapidis, pilæ, &c. </
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<
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nis phœnomena diſtinctiùs explicemus, ſingulis Theorematis ſingulos
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percuſſionis modos explicabimus. </
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Theorema
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11.
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Explicantur omnia phœnomena percuſſionis, quæ infligitur manu, pugno,
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brachio, calce, cornu.
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<
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">Primò, pugnus infligit ictum diuerſo motu; primò, motu recto; </
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">ſit
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enim humerus AB, caput cubiti B, os cubiti BF, fiat arcus AC, & KI,
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ita vt ABK ſit æqualis ABF; </
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<
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">certè ACI erit totum brachium tenſum,
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caput B nunquam recedit ab arcu BC, nec extremitas F à recta FI; </
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<
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autem F peruenit in G; </
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<
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">vbi verò F peruenit
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in H; </
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<
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">aſſumatur HD æqualis FB, & habebitur proportio motus extre
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mitatis F & capitis B; vides motum rectum FI mixtum ex duobus cir
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cularibus circa centrum immobile A, & mobile B. </
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<
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