Clavius, Christoph
,
Geometria practica
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[Handwritten note 71]
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[Handwritten note 72]
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[Handwritten note 73]
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GEOMETR. PRACT.
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circumuoluatur, donec eius linea fiduciæ rectæ a H, per quam extremum E, in-
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ſpectum fuit, reſpondeat, notetur que vmbra verſa b F, abſciſſa. </
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angula a b F, a A E, æquiangula, propter rectos angulos b, A, & </
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A E a, æquales. </
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Vt vmbra verſa b F, # ad quadrati lat{us} a b, \\ 1000. # ita ſpatium A a, \\ notum # ad A e,
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cognita erit longitudo A E, in partibus ſpatij A a.</
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forte dioptra latus d c, vmbræ rectæ interſecet, (quod raro continget, cũ
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plerunque AE, maior, ſit, quam A a,) erit tunc.</
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Vt lat{us} a d, 1000. # ad vmbram rectam \\ abſciſſam: # Ita ſpatium A a, # ad longitu- \\ dinem.
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vt perſpicuum eſt, ſi ducatur ex a, recta ſecans latus d c, &</
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denique dioptra fortaſsis per c, tranſiret, eſſet ſpatium A a, longitudini quæſitæ æquale; </
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& </
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">recta a c, ſi duceretur, faceret cum AE, angulum ſemirectum, atque adeo an-
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gulo d a c, æqualem.</
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diſtantia longitudone A E, cognoſcetur, ſi tamin G, quam in H,
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baculus, ſeu arundo adangulos rectos figatur, ita vt ex A, a, radij per arundinem
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incedentes ad E, ferantur, ſpatiumque A a, cognitum ſit: </
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">LONGITVDINEM in Horizonte è directo menſoris iacentem co-
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gnoſcere, ad cuius extrema neque accedere liceat, neque è loco men-
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ſoris eam dimetiri, neque vlla adſit altitudo, dummodo ad dextram
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vel ſiniſtram per lineam perpendicularem ad locum aliquem ire poſ-
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ſit menſor, ex quo vtrumque extremum appareat.</
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metienda ſit E D, è directo
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menſoris in F, exiſtentis, ita vt neque ad eam acce-
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dere liceat, neque eam è loco F, metiri, neque vlla
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adſit altitudo: </
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larem F G, ad locum G, vnde vtrumque extremum
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D, E, videatur, poſsit accedere. </
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cedens in quiratur ex G, tam longitudo F E, quam
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F D. </
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recto menſoris interuallum aliquod inter duo ſigna, vel etiam inter
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fignum quodpiam ac turrim cognitum eſt, per quadratum coniicere.</
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