Clavius, Christoph
,
Gnomonices libri octo, in quibus non solum horologiorum solariu[m], sed aliarum quo[quam] rerum, quae ex gnomonis umbra cognosci possunt, descriptiones geometricè demonstrantur
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uentum fuerat, ex ſententia res ſuccedet, ſin minus, corrigendus erit error, qui alicubi commiſſus
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eſt. </
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<
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xml:space
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">Præſtat etiam potius incipere diuiſionem circuli à poſteriori hoc puncto inuento, quàm à
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puncto F, quando linea horæ 12. </
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<
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<
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xml:space
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">Tunc enim perpendicularis D F,
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nimis obliquè ſecat circunferentiam, vt vix punctum F, ſine errore poſſit accipi. </
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<
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xml:space
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ligi volo in ſequentibus omnibus horologiis, quæ declinant, & </
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<
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<
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xml:space
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">Si igitur ex pun-
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ctis diuiſionum circuli ad rectam B A, deducantur perpendiculares, vel ipſi C A, parallelæ, ſecan-
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tes rectam B A, in punctis, dabunt rectę ex C, per hæc puncta emiſſę horarias lineas, vt prius.
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</
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<
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xml:space
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">Facile autem erit iudicare, quæ lineæ quibuſnam horis in horologio reſpondeant, ex punctis di-
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uiſionum circuli. </
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<
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xml:space
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">Nam ſemper puncta ab F, verſus B, procedendo, illas horas referunt, quæ in
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horologio horam 12. </
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<
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xml:space
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">ſequuntur verſus lineam ſtyli, vt ex figura patet. </
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<
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xml:space
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">Cęterum lineas illas ad
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rectam B A, perpendiculares ex punctis diuiſionum circuli facile hoc modo ducemus. </
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<
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xml:space
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">Si fortè
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duo puncta puncto B, proxima ab eo æqualiter diſtent, (quod quidem tunc eueniet, cum linea
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ſtyli fuerit etiam linea horaria, vel à duabus horariis lineis æqualiter receſſerit) erunt rectæ lineæ
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coniungentes bina puncta à puncto B, æqualiter diſtantia ad B A, perpendiculares; </
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<
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ſumptum cuiuſuis puncti interuallum ex B, in ſemicirculo ſuperiori transferatur in inferiorem
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ſemicirculum ex eodem puncto B. </
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xml:space
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ad B A. </
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<
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xml:space
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">Idem fiet, ſi interualla punctorum à recta B A, in inferiori ſemicirculo transferantur in
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ſuperiorem ſemicirculum ab eadem recta B A, vt factum eſſe vides in noſtro exemplo.</
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<
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xml:space
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">EX his hoc modo paratis deſcribentur arcus ſignorum, vt in horizontali horologio, & </
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<
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cuum ſignotum
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in horologio de
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clinante à Ver-
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ticali.</
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cali, transferendo nimirum interualla horarum intercepta inter C, & </
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horologii reſpondentes ex centro C; </
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">vel etiam transferendo horaria interualla inter radium Ae-
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quatoris, & </
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<
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">ſignorum radios poſita in lineas horarias horologii reſpondentes, initio facto à linea
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æquinoctiali, &</
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">Si linea ſtyli eadem fuerit, quæ linea quæpiam horaria, vel æqualiter à duabus
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horis hinc inde poſitis receſſerit, transferenda erunt ſingula interualla prædicta in binas lineas
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horarias ęqualiter à linea ſtyli diſtantes, veluti in horologio horizontali, & </
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