Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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205
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tria nihil deſiderare poteſt; </
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<
s
id
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">licèt phyſica fortè aliquid deſiderare poſſit;
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adde quod implicatior illa figura infinitis ferè contexta lineis, quam ha
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bet, equidem erudito Geometræ faciet ſatis, non tamen rudiori Tyroni,
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qui vix in hoc labyrintho tutum ſe eſſe putabit. </
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Theorema
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17.
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Si globus incumbat
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plano inclinato rotatur neceſſariò deorſum
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; </
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">ſit enim
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globus F in plano ED; </
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">ducatur FH perpendicularis deorſum; </
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<
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linea directionis centri grauitatis, vt conſtat; </
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<
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id
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">igitur cùm non ſuſtinea
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tur in prædicta linea, nec enim terminatur ad punctum contactus G, cer
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tè debet rotari; </
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<
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">adde quod non eſt in æquilibrio, vt patet, ratio autem
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inæqualitatis eſt vt GF ad FN, nec vlla eſt difficultas; igitur duplici
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quaſi motu deſcendet in prædicto plano ille globus, ſcilicet motu centri
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propter inclinationem plani, & motu orbis, tùm quia non eſt in æqui
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librio, tùm quia in linea directionis FH non ſuſtinetur à plano. </
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Theorema
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18.
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Si corpus aliquod incumbat
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plano inclinato, ſique linea directionis
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centri grauitatis ſecet ipſum planum intra baſim corpus repit quidem in
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prædicto plano ſed non rotatur, ſi verò cadat extra baſim rotatur, non repit
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; </
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ſit enim planum inclinatum BC, cui incubet cubus DL, cuius cen
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trum grauitatis ſit I; </
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<
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id
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">ducatur RG perpendicularis deorſum per cen
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trum grauitatis I cadit in punctum G intra baſim BG; </
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">igitur non ro
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tabitur, ſed repet; </
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">quia ſi ſuſtinetur in G remoto ſenſim plano BC;
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haud dubiè portio GD non præponderat portioni GL, vt patet ex
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libra. </
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<
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">Sit quoque parallelipedum EK, centrum grauitatis N, perpendicu
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laris ducta per centrum HNM cadit intra baſim; </
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<
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id
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">igitur non rotabi
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tur, quia ſubmoto plano BC non ſuſtinetur quidem in M, ſed minimè
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inclinabitur dextrorſum; igitur non rotabitur. </
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">Si verò cadat extra ba
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ſim haud dubiè rotabitur, ſit enim planum inclinatum AC, cui in
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cumbat parallelipedum FN, cuius centrum grauitatis ſit L; </
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<
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">ducatur L
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perpendicularis, cadit in E extra baſim FD; </
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id
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">certè latus DN inclinabi
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tur deorſum; igitur rotabitur, quia eodem modo ſe habet, quo ſe ha
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beret, ſi ſubmoto plano ſuſtineretur in linea DX, ſed trapezus DX
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PN triangulo FXD præponderat per regulas libræ, de quibus ſuo
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loco. </
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<
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">Obſeruabis autem primò ſciri poſſe data plani inclinatione & baſi
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parallelipedi maximam illius altitudinem, qua poſita non rotetur; </
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ſecus verò poſita quacunque alia maiore; </
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<
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">ſit enim planum AC, ba
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ſis parallelipedi FD; </
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