Clavius, Christoph
,
Geometria practica
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rum quoniam & </
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<
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">alii,
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quamuis aggreſſi omnia, multa tamen inter ſcriben dum præterierunt:
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</
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">decreui, ſi qua poſſem, perficere: </
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<
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">vt, quicquid vtiliter in Geometria
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practica ab aliis traditum, à me etiam inuentum eſt, vnius operis gyro
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clauderetur. </
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<
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">Quod opus, cum ſpecies tres quantitatis continuæ ſint,
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in tria membra, parteſ{q́ue} præcipuas ſecuimus: </
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">In prima rectas lineas,
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in altera ſuperficies, corpora metientes in poſtrema: </
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<
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">cui annectuntur
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alia, quæ non tam ad quantitatis dimenſionem, quam ad alias Geo-
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met@iæ praxes, ac demonſtrationes pertinent, à noſtro inſtituto non
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aliena.</
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<
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">VNIVERSAM autem tractationem in octo libros partiti ſum{us}.</
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">PRIMVS propoſitiones tres omnino neceſſari{as}, & </
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omnium magnitudinum dimenſionem accuratè perficiendam continet.</
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">IN Secundo dimenſio linearum rectarum per Quadrantem Aſtronomi-
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cum tam pendulum, quàm ſtabilem abſoluitur.</
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">TERTIVS de earundem rectarum linearum dimenſione per Quadra-
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tum Geometricum tum pendulum, tum ſtabile, etiam per vnicam ſtationem,
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agit. </
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">Vbietiam, qua ratione ſine huiuſmodi inſtrumento earundem recta-
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rum linearum Dimenſiones nonnullæ fieri poſſint, traditur.</
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">ATQVE hiſce quinque libris omnes tres partes Geometriæ practicæ à
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nobis propoſitæ explicantur.</
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<
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">IN Sexto deinde libro de Geodæſia, ideſt, de ſuperficierum rectiline
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arum
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cuiuſque generis Diuiſione tam per rect{as} ex certo aliquo puncto duct{as},
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quam per line{as} parallel{as}, diſſeritur. </
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">Vbinonnulla etiam alia problemata ad
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idem argumentum ſpectantia ſoluuntur. </
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">Item qua ratione figuræ tam pla-
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næ, quam ſolidæ, vnà
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cum circulo ac ſphæra in data proportione augendæ ſint,
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minuendæúe. </
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">In cui{us} rei gratiam modi aliquot proponuntur inuenienda-
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rum duarum mediarum proportionalium inter du{as} rect{as} dat{as}. </
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ars facilis, & </
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">expedita pro extrabendis radicib{us} cuiuſque generis præſcri-
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bitur.</
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tractantur.</
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