Clavius, Christoph
,
Geometria practica
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LIBER SEPTIMVS.
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ABC. </
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<
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xml:space
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">Dico corpus E, ſphæræ ABC, eſſe æquale. </
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<
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<
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fieri poteſt, primum maius, ſitque exceſſus corporis E, ſupra ſphæram A B C,
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quantitas F. </
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<
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xml:space
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">Intelligatur circa centrum D, deſcripta ſphæra GHK, maior quam
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ſphæra ABC, ita tamen, vt exceſſus ſphæræ GHK, ſupra ſphęram ABC, non ſit
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maior quantitate F, ſed vel æqualis, vel minor, hoc eſt, vt ſphæra GHK, ſit vel ę-
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qualis ſolido E, quando nimirum ipſa excedit ſphærã A B C, præciſè quantitate
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F; </
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<
s
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xml:space
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">vel minor, ſi nimirum ipſa excedit ſphæram A B C, minori quãtitate, quam F.
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</
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<
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xml:space
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">Neceſſario enim aliqua ſphæra erit, quæ vel æqualis ſit magnitudini E, atq; </
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<
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xml:space
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eo maior quam ſphæra ABC; </
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<
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xml:space
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">vel maior quidem quam ſphæra ABC, minor verò
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quam magnitudo E, quæ maior ponitur, quam ſphæra ABC. </
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<
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xml:space
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"> Inſcribatur de- inde intra ſphæram GHK, corpus, quod non tangat ſphæram A B C, ita vt vna-
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quæque perpendicularium ex centro D, ad baſes iſtius corporis eductarum ma-
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ior ſit ſemidiametro A D. </
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<
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xml:space
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">Siigitur à centro D, ad omnes angulos dicti corporis
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ducantur lineæ rectæ, vt to tum corpus in pyramides diuidatur, quarum baſes
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ſunt eædem, quæ corporis G H K, vertex autem communis centrum D; </
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">14. hui{us}.</
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quælibet pyramis æqualis ſolido rectangulo contento ſub eius perpendiculari,
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& </
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<
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<
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">idcirco ſolidum
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/339-01
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rectangulum contentum ſub ſemidiame-
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tro AD, & </
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<
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">tertia parte baſis cuiuslibet py-
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ramidis, minus ipſa pyramide erit. </
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<
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xml:space
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niam omnia ſolida rectangula cõtenta ſub
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ſingulis perpendicularibus ex centro D, ad
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baſes corporis dicti protractis, & </
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<
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">ſingulis
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tertijs partibus baſium, ſimul æqualia ſunt
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toti corpori; </
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<
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xml:space
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">efficiunt autem omnes tertiæ
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partes baſium ſimul tertiam partem ambi-
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tus corporis; </
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<
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xml:space
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">erit ſolidum rectangulũ con-
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tẽtum ſub ſemidiametro AD, & </
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<
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xml:space
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">tertia par-
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te ambitus præfati corporis inſcripti intra
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ſphæram G H K, minus corpore inſcripto.
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</
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<
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">Quoniam verò ambitus corporis inſcripti
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maior eſt ambitu ſphęræ ABC, vt demon-
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ſtrat Archimedes lib. </
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<
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dro propoſ. </
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ambitus dicti corporis maior tertia parte ambitus ſphęrę ABC: </
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<
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">erit ſolidum re-
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ctangulum contentum ſub ſemidiametro AD, & </
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">tertia parte ambitus ſphęrę A-
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B C, hoc eſt, ſolidum E, multo minus corpore inſcripto intra ſphęram G H K: </
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Poſita eſt autem ſphæra GHK, vel æqualis ſolido E, vel minor. </
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<
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ra G H K, minor erit corpore intra ipſam deſcripto, totum parte quod eſt ab-
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ſurdum. </
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<
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<
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<
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, ſi fieri poteſt, ſolidum E, minus, quam ſphęra ABC, exce-
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datur que à ſphęra ABC, quantitate F. </
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<
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xml:space
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">Intelligatur circa centrum D, ſphęra de-
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ſcripta L M N, minor quàm ſphęra A B C, ita tamen vt exceſſus, quo ſphęra
<
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LMN, ſuperatur à ſphęra ABC, non ſit maior quantitate F, ſed vel æqualis, vel
<
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minor, hoc eſt, vt ſphęra LMN, ſit vel æqualis ſolido E, ſi nimirum ipſa exceda-
<
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tur à ſphęra ABC, quantitate F, vel maior ſolido E, ſi videlicet ſphęra L M N, à
<
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ſphęra ABC, ſuperetur minori quantitate, quam F. </
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<
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