. Perspectiva commvnis : ideo sic dicta, quod contineat elementa tes optikes, omnibus philosophiæ studiosis necessaria : in hac enim doctrina inchoatæ disputatioes philosophoru, de natura, & proiectione radiorum unisus, luminum, colorum & formarum absoluuntur : in quibus & de speculis tractatur : summa cura & dilgentia emendata, & ab infinitis quibus scatebat mendis repurgata, necnon in quibus deficiebat demõstrationibus restituta . ,cVuifibilein c» reflecletur formainc3£ punclo E,ad h, dC erit locus imagtnis e > quoniam % h arquedi* ftat c d. Amplius c reflecli poted i pundo z,quoniaro cri
. Perspectiva commvnis : ideo sic dicta, quod contineat elementa tes optikes, omnibus philosophiæ studiosis necessaria : in hac enim doctrina inchoatæ disputatioes philosophoru, de natura, & proiectione radiorum unisus, luminum, colorum & formarum absoluuntur : in quibus & de speculis tractatur : summa cura & dilgentia emendata, & ab infinitis quibus scatebat mendis repurgata, necnon in quibus deficiebat demõstrationibus restituta . ,cVuifibilein c» reflecletur formainc3£ punclo E,ad h, dC erit locus imagtnis e > quoniam % h arquedi* ftat c d. Amplius c reflecli poted i pundo z,quoniaro crianguli c d z, dC h d z, funt ae- quales ,In hoc tame potefi: a pluribus partibus fpecult fierireflexio, ficut patet per prgtmiTam» Locus autem imaginis eft in f« Propofirto XLVII, PolTibile cft^deminfpcculOjConcafto tres habereimagines, Propofitio XLVtijr* Pofiibileeftin fpeculo concauo* unius rei quatuotimagines apparere» Accipiantur enim duo pun&a in diuerfis diametris,quo4rumunurnintracircuIUm,cViaItudinip(a circuli circumferen*tia uel extra fir, ac defcribaturcircu!us,quiha?cdao pundacOcentro fpcculi concluda r, Quod G ifte circuius, iecuerit ctrcu*lum fpeculi in uno loco, erit reflexio ab uno arcu tantum: Qitt, duobus,poterit efle reflexio ab uno pun&o arcus interiacentisdiametros,aut & duobus,aut £ tribus, cV aliquando £ quatuor»Verbigra tia ,fkfpeculum,otfupra abgQjfitegeius centrum d;&. <v <V PERSPECTIVAE COMHVNIJ D:3£f(umamiirduaediamctriAG,Q^B,fitt^terna diameter ezquacangulum a primis contentu diuidit in fu* matur puncftus c, in diametro o^BjUtfit circumferentiac propinquior, cppundus c in demonftratione de dua«bus imaginibus,cVex a g abfcindaf ah linea aequalis igitur quodc refledtitur & pundlo e,& i pundo z,ficutpatetex prajhabitis* Amplius,ref leditur etiam prauerea ab alrjs duobus enim ex pundo c excitatur perpendicularis, hsec necefla-rio cum diametro z E,concurret extrafphaeram fpeculi,ut in puncfr
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Keywords: ., bo, bookauthorpeckhamjohnd1292, bookdecade1540, booksubjectoptics
