Clavius, Christoph
,
Geometria practica
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101 - 110
111 - 120
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131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
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261 - 270
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LIBER PRIMVS.
"/>
filo perpendiculi in partem aliquam integram alicuius quadrantis, illico iuxta
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ſemidiametrum A B, apparebit, ad quem gradum vſq; </
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<
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fuit. </
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<
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xml:space
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">Qui quidem graduum numerus in regula trium tertium occupatlocum, vt
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minuta, atque ſecunda inquirantur, vt paulo poſt Num. </
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<
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xml:space
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<
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<
s
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xml:space
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">4. </
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ſemidiametrum A B, affigenda ſunt duo pinnacidia ad angulos
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xml:space
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">Pinnacidia
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quo pacto af-
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figenda.</
note
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rectos, ita vt foramina, per quę radius ſolis, vel viſualis tranſire debet, ad per-
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pendiculum rectę AB, exiſtant; </
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<
s
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echoid-s1146
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xml:space
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">alio quin non paruus error in dimenſione linea-
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rum committeretur.</
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<
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<
s
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xml:space
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">5. </
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<
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porro per radium viſualem altitudo ſt ellę inueſtiganda eſt,
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<
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xlink:label
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xml:space
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">Pinnacidia
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pro radio vi-
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ſuali quo pa-
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cto conſtruẽ-
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da.</
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vel punctum aliquod lineæ dimetiendæ inſpiciendum, conſtrui debent duo pin-
<
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nacidia hoc modo. </
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<
s
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">In tabella ænea quadrata IK, fiat foramen rotundum medio-
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cris magnitudinis, in cuius medio relinquatur foramen L, quod ſuſtineatur à
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diametro quadam tenui; </
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<
s
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xml:space
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">Et circa I, circumuertatur alia tabella ænea quadrata
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ſubtilis, priori ęqualis, in cuius medio ſit etiam perexiguum foramen M, reſp on-
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dens foramini L, quando hęc tabella priori ſup erimponitur. </
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<
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xml:space
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">Huiuſmodi duo
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pinnacidia ſi fiant, dici vix poteſt, quàm expeditè quamcunque ſtellam, aut a-
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liam quamlibet rem contueri liceat. </
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<
s
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xml:space
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">Nam pinnacidium, quod ab oculo propius
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abeſt, claudendum eſt tabella illa quadrata circumducta circa punctum I, aliud
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autem aperiendum. </
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<
s
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xml:space
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">Sic enim fiet, vt radius viſualis per foramen M, prope ocu-
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lumimmiſſus, illico conſpiciat per maius foramen L, in pinnacidio remotiore
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ſtellam, vel aliam rem propoſitam: </
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<
s
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xml:space
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">quia foramen illud maius apertum facilè
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remipſam intueri, & </
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<
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">ſine vllo negotio foramen exiguum L, in eodem pinnaci-
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dio remotiore in ipſam rem viſum dirigere nosſinit.</
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<
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<
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ex centro A, egrediatur filum ſub tiliſsimum cum appenſo
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">Conſtructio
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regulæ, loco
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fili.</
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perpendiculo. </
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">Aut certè loco fili conſtruatur regula ænea admodum tenuis
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cum linea fiducię, in cuius extremitate promineat laminula, ex qua ſuſpendatur
<
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perpendiculum hac conditione, vt regula liberè pendente, filum aliquod cum
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perpendiculo demiſſum, ad vnguem lineę fiducię reſpondeat. </
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<
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">Atq; </
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<
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">in hoc ſum̃a
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diligentia adhibenda eſt, alioquin gradus non rectè à linea fiducię indicarentur.</
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<
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hoc modo Quadrans in ſuo vſu erit pendulus, ſiueres in ſublimi
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">Quadrans
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pendul{us}.</
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exiſtens ex B, per A, ſiueres in plano poſita ex A, per B, inſpiciatur.</
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<
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ſi circa centrum A, regula affigatur cum linea fiducię AB, & </
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<
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pinnacidijs c, b quorum foramina lineę fiduclę reſpondeant, ipſa queregula ita
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<
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">Quadrans
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ſtabilis.</
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firmetur, vt cir ca centrum circumducta ad quemcunque gradum immota per-
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maneat, erit Quadrans in ſuo vſu ſtabilis eundem ſemper ſitum habens, ſiueres
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in ſublimi exiſtens inſpiciatur ex A, per b, poſito nimirum latere A C, Horizonti
<
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parallelo, in plano Horizontali, ſiue rem in plano poſitam quis intueatur ex A,
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per b, latere A C, ad Horizontem exiſtente perpendiculari, & </
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<
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Horizonti parallelo, ſuperioremq; </
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<
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">locũ occupante. </
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<
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ligentur, cum de vtro que vſu lib. </
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<
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<
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<
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quadrantis hoc modo conſtructi in minutis, ac ſecundis exquiren-
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<
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tis proximè
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conſtruct in
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minutis ex-
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quirendis.
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<
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</
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dis, pręclarus eſt. </
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<
s
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xml:space
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">Nam cadente filo perpendiculi, aut linea fiducię AB, in par-
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tem aliquamintegram alicuius Quadrantis (quod ferè ſemper accidet propter
<
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diuerſitatem partium in tanta quadrantum multitudine) ſi fiat vt 128. </
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<
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">nimirum
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vt numerus partium, in quas quilibet arcus productus diuiditur, ad partes à filo
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abſciſſas, ita numerus graduum in toto arcu pro ducto comprehenſorum, in
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cuius partem aliquam integram filum incidit, ad aliud, reperietur numerus </
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