Clavius, Christoph - Geometria practica

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183153LIBER TERTIVS. mus, percepta fuerint, eadem ſemper ratio metien darum rectarum tenenda erit,
ſi vtra que extremitas rectæ propoſitæ cerni poteſt, vt diximus.

2. Sed neque hoc omittendum puto, quando inuentæ ſunt duæ diſtantiæ
à menſoris loco vſque ad duas extremitates rectæ metiendæ, vna cum angulo
ab ipſis comprehenſo, certius (quam quam laborioſius) interuallum inter duo
illa extrema, hoc eſt, rectam propoſitam inueniri poſſe ex duabus illis diſtantijs,
& angulo comprehenſo, per 12. triang. rectil. quam per duas dictas portiones
illis diſtantijs proportionales: propterea quod interuallum inter extrema illa-
rum portionum vix accurate per circinum reperiri poſsit. Id quod etiam in pro-
blem. 16. ad finem Num. 2. monuimus.

SPATIVM terræ inæquale pro ducendis aquis librare: aut etiam ſi lu-
bet, Horizonti æquidiſtans efficere.

PROBLEMA XLV.

1. Qvando oblatum ſpatium non eſt valde magnum, excogitauit Ioan-
11Inſtrumenti
conſtructio
pro librationi-
b{us} nes Ferrerius Hiſpanus nobilis Architectus, & Mathematicus, inſtrumentum

114[Figure 114] percommodum pro librationibus, hoc modo. Compingantur duæ regulæ AB,
AC, ex ligno aliquo ſolido, ac duro, æqualium crurum, quæ longitudinem ha-
beant ſatis longam, ita vt diſtantiæ inter extrema B, C, contineat 10. palmos prę-
ciſe, aut etiam plures. Deinde ducta recta AG, ad BC, perpendiculari, deſcriba-
tur ex A, ſemicirculus quantuſcunque I D K, cuius ſemidiameter A D, in totæ-
quales partes ſecetur, quot palmi in diſtantia B C, comprehenduntur. Deſcri-
pto quoq; circa A D, ſemicirculo occulto A E D, transferantur ex D, in eius pe-
rip heriam omnia interualla inter D, & puncta rectæ A D: ac tandem ex A, per
ſingula puncta ſemicirculi AED, rectæ occultæ emittantur, notenturq; interſe-
ctiones earum cum peripheria D I, at que in alteram peripheriam D K,

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Scan	Original
121	91
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124	96
125	95
126	96
127	97
128	98
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133	103
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136	106
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149	119
150	120

Scan	Original
121	91
122	92
123	93
124	96
125	95
126	96
127	97
128	98
129	99
130	100
131	101
132	102
133	103
134	104
135	105
136	106
137	107
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145	115
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