Ceva, Giovanni
,
Geometria motus
,
1692
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Nouum genus Baliſtæ
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Explicatio.
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Tab.
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9.</
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">IN hac figura exprimitur nouum genus Bali
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ſtæ, quæ machina præſertim in mole maio
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ri, non parum vtilitatis afferre poteſt rei mi
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litari ad eiaculanda miſſilia, vt demonſtra
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bitur. </
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<
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">Ex eius verò partibus, quas ſubinde
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recenſeo, etiam modus ſtructuræ apparebit. </
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">Punctum M centrum machi
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næ. </
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">Per cauitatem M tranſit telum emiſſum. </
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ſeritur manubrium, vt in baliſtis vulgaribus. </
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capitibus A, N adnectitur funis. </
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ſunt in linea recta. </
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id
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">Interualla AE, EF, FG, GI, IK ſunt (li
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cèt non neceſſariò) æqualia. </
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id
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">Altitudinis, ſeu commiſſuræ
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KL, IH, GD, FC, EB ſunt perpendiculares rectæ occultæ
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KA. </
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<
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id
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">Singulæ autem, dum curuatur arcus, aperiuntur cer
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ca centra K, I, G, F, E. </
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<
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id
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">Hinc ſequitur vt funis ex medio
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dum attrahitur in O, aperiantur prædictæ commiſſuræ, ſeu
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nodi, & curuentur vtraque brachia, vt in eorum altero ap
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paret punctis notato. </
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<
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id
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">Quilibet ex his nodis arctiſſimè ſtrin
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gitur ſupernè, a ſuo elaterio, vt videre eſt in L, H, D, C, B.
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<
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">Elateria autem quò propinquiora centro M tanto maiora,
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& craſſiora debent eſſe remotioribus: Hinc fit vt, propter
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molem opportunè auctam, æquè facilè aperiantur, ac cæ
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tera; & vice verſa, propter craſſitiem maiorem, ſibi relicta
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validiùs reſtringantur. </
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<
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dabimus. </
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<
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id
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">His poſitis facile eſt oſtendere, quantum præſtet hu
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iuſcemodi machina vulgaribus & communibus baliſtis. </
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<
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">Primùm, in Triangulo ALK cùm altitudines EB, FC,
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GD, IH, KL ſint perpendiculares, ideoque parallelæ, hinc </
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