Clavius, Christoph
,
Geometria practica
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LIBER TERTIVS.
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mus, percepta fuerint, eadem ſemper ratio metien darum rectarum tenenda erit,
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ſi vtra que extremitas rectæ propoſitæ cerni poteſt, vt diximus.</
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<
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neque hoc omittendum puto, quando inuentæ ſunt duæ diſtantiæ
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à menſoris loco vſque ad duas extremitates rectæ metiendæ, vna cum angulo
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ab ipſis comprehenſo, certius (quam quam laborioſius) interuallum inter duo
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illa extrema, hoc eſt, rectam propoſitam inueniri poſſe ex duabus illis diſtantijs,
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& </
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<
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illis diſtantijs proportionales: </
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">propterea quod interuallum inter extrema illa-
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rum portionum vix accurate per circinum reperiri poſsit. </
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<
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blem. </
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<
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bet, Horizonti æquidiſtans efficere.</
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oblatum ſpatium non eſt valde magnum, excogitauit Ioan-
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conſtructio
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pro librationi-
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b{us}</
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nes Ferrerius Hiſpanus nobilis Architectus, & </
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percommodum pro librationibus, hoc modo. </
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AC, ex ligno aliquo ſolido, ac duro, æqualium crurum, quæ longitudinem ha-
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beant ſatis longam, ita vt diſtantiæ inter extrema B, C, contineat 10. </
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<
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ciſe, aut etiam plures. </
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">Deinde ducta recta AG, ad BC, perpendiculari, deſcriba-
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tur ex A, ſemicirculus quantuſcunque I D K, cuius ſemidiameter A D, in totæ-
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quales partes ſecetur, quot palmi in diſtantia B C, comprehenduntur. </
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pto quoq; </
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<
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">circa A D, ſemicirculo occulto A E D, transferantur ex D, in eius pe-
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rip heriam omnia interualla inter D, & </
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ſingula puncta ſemicirculi AED, rectæ occultæ emittantur, notenturq; </
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ctiones earum cum peripheria D I, at que in alteram peripheriam D K, </
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