Clavius, Christoph
,
Geometria practica
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114-01
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xml:space
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">GEOMETRIÆ
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PRACTICÆ
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LIBER TERTIVS.</
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">Earundem linearum rectarum dimenſionem per
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Quadratum Geometricum exequens.</
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<
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">QVONIAM dimenſio rectarum linearum per Qua-
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drantem Aſtronomicum ſuperiori lib. </
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<
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">expoſita requirit
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tabul{as} Sinuum, Tangentium, & </
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<
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">ſecantium, non ſem-
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per autem eiuſmodi tabul{as} ad manum habere poſſu-
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m{us}, immo neque omnes in illis verſati ſunt, atque exer-
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citati: </
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<
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xml:space
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">propoſitum nobis tertio hoc libro eſt, line{as} rect{as},
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longitudines videlicet, latitudines, altitudines, & </
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<
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funditates dimeriri per Quadratum Geometricum, vbi prædictis tabulis non
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indigem{us}, ſed omnia per vmbram rectam, & </
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<
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<
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">vt vocant, expediuntur.
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</
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<
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">Qua tamen in re non nihil ab aliis ſcriptorib{us} diſſidebim{us}, quippe cum aliter
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tam vmbram rectam, quam verſam in partes diuiſuri ſim{us}, quam ab illis fieri
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ſolet: </
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<
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">vt nimirum per noſtram partitionem expediti{us} dimenſiones perfician-
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tur; </
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<
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">quod prudens Lector facilè iudicabit, ſi noſtrã hanc diuiſionis rationem cum
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aliorum partitione contulerit. </
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<
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">Sed principio Quadr atum Geometricum con-
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ſtruendum est, explicandumque quo pacto tam in Quadrato ſtabili, quam in
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pendulo vtraque vmbra, recta videlicet, ac verſa conſiderari debeat. </
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<
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">Neque
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enim ſemper eundem ſitum prædictæ vmbræ in inſtrumento ſeruant, ſed pro va-
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rietate vſuum non raro eum permutare ſolent, vt exiis, quæſequuntur, liquido
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conſtabit.</
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quauis materia ſolida & </
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">dura conficiatur quadratum A B C D, ſiue
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Quadrati
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Geometrici.</
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ſolidum totum, ſiue excauatum: </
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BC, CD, DA, ita compactum, vt omnes in vno eo demqueplano exiſtant. </
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