Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Theorema
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49.
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In progreſſione arithmetica ſi diuidatur numerus terminorum bifariam æ
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qualiter nunquam ſumma poſterioris ſegmenti eſt tripla prioris
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; ſed ſi acci
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piantur duo termini eſt tantùm 2/1, ſi 4. eſt 7/3 ſi 6. eſt (15/6), ſi 8. eſt (26/10), ſi 10
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(40/15), ſi 12. (57/21), ſi 14. (77/28), atque ita deinceps. </
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<
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">Ex quo obſerua mirabilem conſequutionem; </
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<
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tantùm duo termini, & diuidantur bifariam, ſumma poſterioris medie
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tatis eſt tripla primæ minùs vnitate; </
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<
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">ſi accipiantur 4. eſt tripla minùs
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2. ſi 6. minùs 3. ſi 8. minùs 4. ſi 10. minùs 5. ſi 12. minùs 6. ſi 14. mi
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nùs 7. atque ita deinceps; vnde ſumma poſterioris medietatis eſt ſemper
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tripla minùs numero ſuorum terminorum, vel quod clarum eſt minùs
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ſubduplo vltimi, ſeu maximi termini, vel numeri terminorum totius
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progreſſionis, quod probè omninò tenendum eſt, vt omnes experientiæ
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explica ri poſſint, quod infrà faciemus. </
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Theorema
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50.
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Ex dictis hactenus facilè redditur ratio maioris ictus eiuſdem corporis im
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pacti quod cadit ex maiori altitudine
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; fuit hyp. </
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">1. ſed ideò eſt maior ictus,
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quia maior imprimitur impetus, vt patet, at ideò maior impetus impri
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mitur, quia maior eſt imprimens per Ax. 2. creſcit enim impetus, vt
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conſtat ex dictis. </
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Theorema
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51.
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Hinc quoque ratio maximæ percuſſionis ex ſolo pondere cadentis illius arie
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tis inflictæ
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; quâ ſcilicet altè infiguntur lignei pali, quibus in mediis
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aquis tanquam iacto fundamini ſuperædificatur ingens ſæpè ædificij
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moles. </
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52.
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Hinc ex minima altitudine cadens corpus graue minimum ferè ictum in
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fligit
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; quia primus impetus valdè debilis eſt, qui tamen deinde facta
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acceſſione maximus ferè euadit. </
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Theorema
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53.
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Hinc ratio, cur tanta ſit differentia impetus grauitationis, & percuſſionis
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ab eodem mobili
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; </
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<
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">quia ſcilicet quantumuis tempore breuiſſimo mouea
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tur, plurimis tamen eius motus durat inſtantibus; atqui quolibet inſtan
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ti motus acquiritur impetus æqualis primo impetui grauitationis, vt
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conſtat ex dictis. </
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<
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">v. g. ſit mobile quod moueatur per mille inſtantia
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(modicum certè tempus & minimè ſenſibile) poſt hunc motum impetus
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erit millecuplus; </
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<
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id
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">igitur effectus etiam millecuplus; quæ omnia conſtant
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ex dictis. </
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Theorema
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54.
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Hinc percuſſio quæ fit in primo inſtanti contactus creſcit vt tempus
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; </
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<
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cùm ſingulis inſtantibus creſcat impetus per partes æquales, & cùm per
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cuſſio ſit vt impetus; etiam erit vt tempus; </
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<
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">igitur percuſſio, quæ fit poſt
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duo inſtantia motus eiuſdem corporis grauis deorſum cadentis eſt du-</
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