Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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<
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">DE TROCHLEA.</
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">Trochlea eſt inſtrumentum veluti conce
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ptaculum quoddam, aut capſula, vnum, vel
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plures ſtriatos orbiculos, ſeu rotulas in ſe
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continens, axiculis per rotulas traiectis, circa
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quos illæ vertuntur, quibus admoto fune du
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ctario eleuantur, aut remittuntur onera. </
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">Conſtare autem
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ſolet Trochlea ex vno, vel pluribus orbiculis tanquam inter
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thecas inſertis, non quidem æqualibus, ſed maioribus ſuper
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minores adiectis, ne vnius funis circumductus funem alte
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rius impediat. </
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">Inſuper ipſi orbiculo, modò bini ſuper binos
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locari conſueuerunt, ita vt in trochlea quatuor, vel ſex or
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biculi, duplici, vel triplici ordine
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reperiãtur
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diſpoſiti; modo
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verò non niſi ſinguli ſuper ſingulos, totidem ordinibus con
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tinentur, vt quo potuimus modò hic figuris expreſsimus. </
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<
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">Reducitur autem Trochlea ad Vectem, & conſequen
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ter ad libram, quia vnuſquiſque orbiculus illius per diame
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trum nititur proprio axiculo tanquam fulcimento, quod in
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ter onus leuandum, aut ſuſtinendum, & potentiam eleuan
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tem locatur, ita vt ad depreſsionem vnius extremitatis dia-</
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