Clavius, Christoph
,
Geometria practica
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LIBER TERTIVS.
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">EX ALTITVDINIS alicuius faſtigio, etiamſi altitudo ſit menſoris
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ſtatura, diſtantiam inter duo ſigna in plano, cui altitudo inſiſtit, ſiea
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diſtantia è directo menſoris iaceat, & </
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poſſit, per quadratum comprehendere.</
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diſtantia metienda AB, è directo altitu-
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dinis C D, in qua oculus menſoris exiſtat in D, fa-
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ſtigio. </
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<
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">Per problema antecedens inueſtigetur ex
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vertice D, tam diſtantia C B, quam C A. </
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nim hæc ex illa maiore detracta notam relinquet
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diſtantiam A B, inter ſigna A, & </
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<
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">B, in partibus al-
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titudinis C D, in quibus videlicet diſtantiæ etiam
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C B, C A, inuentæſunt.</
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altitudo C D, ſit ſtatura menſoris, reperietur eodem modo diſtantia,
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A B, ſi oculus menſoris in D, vtrum que extremum A, B, cernere poſsit, vt liquet.</
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<
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">LONGITVDINEM in Horizonte extenſam metiri per Quadratũ,
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quando menſor in vno eius extremo exiſtens alterum extremum vi-
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dere non poteſt, propter tumorem aliquem interiectum, neque alti-
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tudo in promptu eſt, ſed ſolum ad dextram, vel ſiniſtram per lineam
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perpendicularem recedere poteſt ad locum, è quo alterum extremũ
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appareat.</
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longitudo metienda A E, cuius extre-
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mum E, ex A, menſorvidere non poſsit, neq; </
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<
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ſit altitudo, ſed tamen ſi ad dextram, vel ſiniſtrã
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recedat per lineam perpendicularem A a, vſque
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ad a, illud videre poſsit. </
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<
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">Quadratum ſtabile ita
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erigatur, vt eius planum longitudini A E, con-
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gruat. </
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<
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">Debet namque conſtare, quænam recta
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ad extrema A, E, pertineat, hoc eſt, rectam con-
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ſtituat, cum data longitudine. </
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<
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to quadrato in Horizontis plano, ita vt latus
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A B, a longitudine non recedat, extendaturrecta
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per latus A D, vſq; </
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<
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">ad a, vnde extremum, E, ap-
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pareat, ſitque ſpatium A a, per aliquam menſu-
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ram notum. </
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<
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">Erectum autem in a, quadratum
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circumducatur, donec per eius planum extre-
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mum E, cernatur. </
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<
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Horizonte collocetur, latuſque a d, perpendiculari A a, congruat: </
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