Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Theorema
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17.
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Si motus mixtus conſtet ex æquabili, & accelerato naturaliter ſit per li
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neam curuam
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; </
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<
s
id
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">ſit enim impetus per AF motu æquabili, & per AC motu
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accelerato naturaliter, ita vt eo tempore quo percurritur ſeorſim ſpa
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tium AB percurratur AD triplum; </
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<
s
id
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">certè ex vtroque primo tempore re
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ſultat linea motus mixti AE, ſecundo tempore EG, ſed AEG non eſt
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recta; alioquin duo triangula ABE, ACG eſſent proportionalia, quod
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eſt abſurdum. </
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Theorema
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18.
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Hæc linea eſt Parabola
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; </
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<
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id
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">quod ipſe Galileus toties inſinuauit, & quiuis
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etiam rudior Geometra intelliget; in quo diutiùs non hæreo, præſertim
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cùm nullus ſit motus, qui conſtet ex æquabili, & naturaliter accelerato,
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vt demonſtrabimus infrà. </
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Theorema
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19.
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Si motus mixtus conſtet ex æquabili & naturaliter retardato, fit per lineam
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curuam
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; ſi enim eo
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quo per NE ſurſum proiicitur corpus graue
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& conſequenter motu naturaliter retardato impellatur per NI motu
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æquabili, diuidatur NI in 4. partes æquales v.g. ductis parallelis RD,
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NE, PC, &c. </
s
>
<
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id
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">aſſumatur NS vel RM, cui affigatur quilibet numerus impar; </
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putà 7. itaque RM ſint 7. ducatur HM parallelæ IN, aſſumatur QL 5.
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ducatur GL parallela, accipiatur VK 3. ducatur FK: </
s
>
<
s
id
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N1A996
">denique aſſumatur
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FAI ducaturque AE parallela IN, & deſcribatur per puncta AKLMN,
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linea curua; </
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<
s
id
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">hæc eſt Parabola, vt conſtat ex Geometria; </
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>
<
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id
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">nam ſi BK eſt 1.
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CL erit 4. DM 9. EV 16. ſed æquales ſunt AF.AG.AH.AI. prioribus vt
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patet; </
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<
s
id
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">igitur ſagittæ ſunt vt quadrata
<
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applicatarũ
">applicatarum</
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; </
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<
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">igitur hæc eſt Parabola;
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igitur curua, atqui motus mixtus prædictus fieret per hanc lineam, nam
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eo tempore quo mobile eſſet in S, erit in M, concurrit enim vterque im
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petus pro rata, & eo tempore, quo eſſet in K erit in L, atque ita
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deinceps. </
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Scholium.
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id
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<
s
id
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">Obſeruabis eſſe prorſus inuerſam prioris, quæ ſit ex motu æquabili, &
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naturaliter accelerato; </
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<
s
id
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">ſi enim per AE ſit æquabilis & æqualis priori
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per NI, & per AI ſit acceleratus, ſi quo tempore peruenit in B motu æ
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quabili perueniat in F motu accelerato; haud dubiè perueniet in K, mox
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in L, &c. </
s
>
<
s
id
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N1A9DE
">quia eadem proportione, ſed inuerſa quâ retardatur,
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acceleratur; </
s
>
<
s
id
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N1A9E4
">igitur ſi vltimo tempore retardati acquirit tantùm
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YE; </
s
>
<
s
id
="
N1A9EA
">primo tempore æquali ſcilicet accelerati acquiret AF, atque ita
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deinceps ſi per NE ſit retardatus, & per NI æquabilis linea motus mixti
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erit NLA; </
s
>
<
s
id
="
N1A9F2
">ſi verò ſit per AI acceleratus, & per AE æquabilis æqualis
<
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priori per NI, lineamosus mixti erit ALN eadem ſcilicet cum priori
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mutatis tantùm terminis à quo, & ad quem; vtrùm verò in rerum natu
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ra ſit huiuſmodi motus videbimus infrà. </
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