Clavius, Christoph
,
Geometria practica
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GEOMETR. PRACT.
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& </
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<
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">dioptra ad illud punctum mente notatum dirigatur, indicabunt gradus in-
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ter illam ſemidiametrum, & </
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<
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<
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que altera illa ſemidiameter præcisè in C, tendat, angulus C G D, rectus erit.
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<
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">Quia ergo in triangulo G C D, obliquangulo latera nota G C, G D, continent
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angulum notum G; </
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cap. </
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<
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numeris facile problema ſoluetur, ſi fiat angulus G, æqualis
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ei, qui per Quadrantem obſeruatus fuit, & </
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<
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">in rectis G C, GD, ex inſtrumento
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ſolutio ſine
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numeris.</
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partium tot particulæ ſumantur, quot palmi, aut pedes in diſtantiis G C, GD,
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inuenti ſunt, & </
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">LONGITVDINEM lineæ rectę, quando menſor in vno eius extre-
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mo, vel in aliqua altitudine nota, quę perpendicularis ſit in eo extre-
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mo ad planum, in quo linea iacet, exiſtens alterum extremum videre
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poteſt, per Quadrantem comprehendere.</
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exquirenda longitudo A B, hoc eſt, diſtan-
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tia inter A, & </
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tumores interiectos, ſiue propter valles, cerninequeant,
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dummodo in extremo A, exiſtens menſor, vel in aliqua
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altitudine cognita ad planum, in quo linea A B, perpen-
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diculari, ita vt A C, ſit vel ſtatura menſoris, vel haſta ali-
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qua erecta, vel turris. </
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ſito ſinu toto AC, diſtantia AB, eſt Tangens anguli obſeruati C: </
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Vt ſinus totus \\ AC, # ad AB, tangentem anguli \\ obſeruati C. # Ita AC, ſtatura menſoris, \\ vel altitudo nota, # Ad AB, longi- \\ tudinem.
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<
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rectil.</
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ſinus etiam producetur, ſi fiat,</
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Vt ſinus anguli B, com- \\ plenti anguli C, ob- \\ ſeruati # Ad AC, ſtaturam menſo- \\ ris, vel altitudinem no- \\ tam # Ita ſinus angu- \\ li C, obſerua- \\ uationis # ad AB, longi- \\ tudinem
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numeris eadem longitudo AB, cognoſcetur, vt in præcedentibus
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blematis ſine
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numeris.</
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dictum eſt: </
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rum, quot palmi, pedeſue in altitudine AC, exiſtunt, conſtituatur que angulus
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obſeruationis C, ac tandem ad AC, perpendicularis excitetur AB, & </
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modo ea appareant, & </
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pertingat, ex altitudine aliqua nota dim@tiri:</
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