Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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frà rectam AG deſcendat, nec ab hac poſſit diſcedere; certè non ideò
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globus volvitur, vt centrum A deſcendat, cùm deſcendere poſſit, etiamſi
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non volvatur; igitur ideò volvitur, ſeu rotatur, quia cum vtroque modo
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deſcendere valeat centrum A, per eandem ſcilicet lineam AG, & cùm pri
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mo modo difficiliùs deſcendat, propter affrictum partium; ideò ſecundo
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modo deſcendit, quia ſic faciliùs deſcendit; ſic enim corpus grave non mo
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do determinatum eſt ad motum, ſed etiam ad faciliorem, cæteris paribus,
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motum. </
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Auguſtin.
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<
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id
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"> Audivi hactenus, in rotis valere rationem vectis; eſt enim
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vectis quidam perpetuus; vnde manifeſta petitur ratio, cur majoribus
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rotis currus inſtruantur; nempe inde creſcit mechanicæ potentiæ mo
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mentum. </
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Antim.
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"> Quis negat, in rotis haberi rationem vectis in vecte tamen ſup
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ponitur aliquod punctum quaſi immobile, quod in ipſo Hypomoclio col
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locatur; quod vt meliùs intelligatur. </
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">Supponatur planum DH eſſe horizon
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tale, in quo ſit rota, eaque trahatur fune
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AG, inſerto ſcilicet axe per
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centrũ
">centrum</
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illius
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A, haud dubiè ſi æquè facile
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vtraq;
">vtraque</
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extre
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mitas diametri rotæ DC adduci poſſet à
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potentia trahente per AG vtraque extre
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mitas, ac proinde reliquæ omnes partes
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rotæ per parallelas AG adducerentur, &
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omnes æquè citò
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moverẽtur
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, vt reverà fit,
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ſi rota humido innatet; at
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cũ
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propter
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af-frictũ
">af
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frictum</
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planireta; detur D, ac proinde difficiliùs accedat:
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punctũ
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C longè faci
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liùs accedit; item A. &c. </
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<
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">ac proinde citiùs
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accedũt
">accedunt</
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, ex quo inæquali acceſſu,
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propter partium nexum, motus orbis neceſſariò ſequitur: Iam vero ſuppo
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ne planum inclinatum, & nullam potentiam extrinſecam applicatam eſſe
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centro A, ſed ſolam ineſſe gravitatem rotæ, quæ à centro A exeritur ab
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intrinſeco, eodem prorſus modo, quo ante à potentia, fune applicata
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in plano horrizontali, & vt potentia extrinſeca movet rotam eo motu, quo
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faciliùs moveri poteſt, mixto ſcilicet ex motu centri & orbis, in hoc plano,
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ita & propria rotæ gravitas in inclinato; quid clarius? </
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id
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">maneat igitur illud
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principium, quòd ſcilicet corpora eo motu moveantur, cæteris paribus, quo
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faciliùs moveri poſſunt. </
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Auguſtin.
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<
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id
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"> Do manus, & rem optimè capio, ſed antequam vlteriùs per
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gas, vnum ex te, Antime; reſcire velim, circa ca, quæ in heſterno con
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greſſu à te accepi. </
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<
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id
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">Illico probavi, vbi diſceſſiſti, pulcherrimum illud expe
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rimentum tubi vitrei, in quo aqua per ſpiras deſcendit, dum ſurſum extru
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dit, eo, quo dixiſti, modo incluſam illam aëris portionem; obſervavi
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enim. illam aëris portionem in cylindrum priore contractiorem, vt labenti
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aquæ ſecus cavam tubi ſuperficiem locus detur, conformari, ita vt tamen
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ſupicma pars ſit convexa ſphærica infima verò baſis, omnino plana, ſaltem
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provt oculo ſubjicitur. </
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