Clavius, Christoph
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Geometria practica
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LIBER TERTIVS.
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Vt differentia vmbrarum \\ verſarum # ad D E, differen- \\ tiam ſtationum # Ita vmbra verſa \\ maior # ad EB,
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fietrurſus nota recta E B, &</
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<
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denique in vna ſtatione latus vmbræ rectæ ſecetur, & </
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vmbræ verſæ, reducenda erit vel vmbra recta ad verſam, vel verſa ad rectam.
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Vt differentia vmbrarum \\ ſiue verſarum, ſiue rectarum, # ad D E, differen- \\ tiam ſtationum: # Ita vmbr a verſa \\ velrecta maior # ad E B.
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iterum producetur recta E B, in partibus differentiæ ſtationum D E, &</
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<
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vnicam quoque ſtationem aſſe quemur altitudinem putei, quemad-
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modum in ſcholio probl. </
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<
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videlicet in A, quadratum ita ſtatuatur, vt centruma, dioptræ
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ſuperius ſit, & </
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gat, ad inueniendam diſtantiam, vel hypotenuſam A C, &</
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rat. </
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trum dioptræſit in A, & </
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Adeo vt per dioptram puncto C, inſpecto, radius viſualis ab
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hypotenuſa A C, non differat. </
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Vt eb, vmbra verſa # ad lat{us} ba, # ita lat{us}a A, # ad aliud,
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inuenietur hypotenuſa A C. </
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quadrato, vt in ſcholio problem. </
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componendo.</
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Vt portio dioptræ A E, \\ iuuenta # ad hypotenuſam inuen- \\ tam A C: # {it}a lat{us} \\ A D, # ad aliud,
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prodibit altitudo, ſiue profunditas A B.</
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ſi latitudo orificij A M, vel fundi B C, cognita fuerit, quæ facile
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per aliquam menſuram cognoſci poterit facilius per vnam duntaxat ſtationem
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in D, factam, & </
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ciemus. </
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Vt vmbra recta, ſi ea abſciſſa \\ fuerit, # ad lat{us} quadrati: # Ita latitudo cogni- \\ ta B C, # ad AB,
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#### Vel
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Vt lat{us} qua- \\ drati # ad vmbram verſam, ſiea \\ fuerit abſciſſa: # Ita latitudo cogni- \\ ta B C, # ad AB,
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pro ducetur AB, profunditas nota in partibus latitudinis.</
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<
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">Et ſi forte dioptra per punctum C, in quadrato tranſeat, erit latitudo BC, re-
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ctæ A B, æqualis.</
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porro praxes demonſtratæ ſunt omnes in prædicto problemate 9. </
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vltima Num. </
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<
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ſi non ſit valde inæqualis, & </
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conſpici poſſit, per quadratum cognoſcere.</
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