Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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<
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<
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X ducatur recta, quæ ſit incidentis ad datam poſitione rectam CB
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parallelè refractus.</
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<
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<
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<
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gotium; </
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<
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xml:space
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<
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<
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<
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<
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xml:space
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">& </
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<
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xml:space
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ſam T adæquante deſcribatur circulus refringentem interſecans in N;
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</
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<
s
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">è præmiſſis admodum patet connexum NK per N incidentis ad BC
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paralleli refractum eſſe; </
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<
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R. </
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<
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<
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nentes, generatim conceptum _Problema_ Solidum eſt, aut pluſquam
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Solidum (ut ex analyſi non difficilè perſpiciatur) & </
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<
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ſuetâ, per lineas vulgò receptas, conſtructu perquam arduum & </
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operoſum; </
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<
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">ità quidem ut licèt mihi non penitus incomperta ſit metho-
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dus ejuſmodi conſtructionem non unam moliendi, ægrè poſſim addu-
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ci, tantum ut ei temporis, tantum laboris impendam, quantum
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expoſcit; </
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<
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">ſuffecerit itaque modum indigitare, quo per lineam quan-
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dam ſibi peculiarem, punctatim facili negotio deſignabilem, ità
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conſtrui poſſit, ut unà ſuam naturam ac indolem prodat. </
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<
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ſic habet.</
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<
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punctum V indeſinitè protendatur recta FG, datæ CB parallela;
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<
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FG decuſſantes punctis H; </
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petuùm æquantè deſcripti circuli rectis CI occurrant punctis N; </
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hujuſmodi puncta quævis linea tranſit, quam innuimus expoſiti _Pro-_
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_blematis_ Solutioni deſervituram; </
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<
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gentis interſectio quæpiam incidentiæ punctum erit, ad quod per X
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ducta recta refringetur in aliquam ipſi BC parallelam; </
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<
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hæc in illam. </
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<
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<
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ſam BC ſecet in K; </
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<
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tum CK. </
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unde ſecundum oſtenſa liquet NXKrefractum eſſe ipſius MN; </
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quod oportebat factum. </
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<
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exequi, nec non ejuſce qualitatem intueri; </
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<
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li centrum meent definire, ſingulóſque reipsâ deſignare; </
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giuſculum eſſet ſigillatim exponere. </
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<
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