. 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 . apparet lmaooin concurfu radrj cum catheto7id eftyinea dudia in cen*trumfpharrx* Hocprobari poteft experientfa, cVex caufis naturalibus,ut fupra in fpeculis planis
. 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 . apparet lmaooin concurfu radrj cum catheto7id eftyinea dudia in cen*trumfpharrx* Hocprobari poteft experientfa, cVex caufis naturalibus,ut fupra in fpeculis planis patetV Inhoc tamen d/fferUnt,quia in planiXutfuprauifumeft^res femper tantum apparet fubfpecu loquantumeftfupra. Infphaericis autem extra politis,imago aliquandoapparetinipfa fpeculifuperffcie,aliquandointra al? quando extt a. Verbigratia,Sitpunclus uifus E^oculus g pun* c^usreflexionisN,centruuerofphae- * rse d. Planum eft, qudd locus imagU nis eft h ,Qubd fi pona tuifibile in b , apparebit imago in of Quod fipona tur uifibileadhuc prop inquius fphae* rae, apparebit extra fphaera, ficut hxc experimentarjti facile patebit. Pun- d:us autem reflexionishaud dirTkuI* ter inuenietur, praefertim cu oculus cVres uifa xqualiter aiphaera diftant. C Alias autem inuentio huius pimcti eft res raaioris Iaboris $C difficuka- tis quim utilitacis, Q lontam appa« ret ia capite de his etiaa» apparcc,q Jioi imgo ia taitbus fpecu. Perspectivab Commvnij lisfit propinquiorqudmrcs uifa,quod non cftin plamXficucfupra patuit. Propofitio XXXI» In fpcculis fphaericis exterioribus, partes rci ficutfunt ordinatas apparerc* Excmpli gratfa,Sit rcs uifa a b , centrum fpeculi d, oculus e»Planum eft,quod radius e HConcurrit cum perpendiculari a din pundo f, cV radius e k cum perpendiculari b d in pundo g, Erit igitur imago g f, minor quidem re^ uifa,fed tamen partes inconfufe & ordi nateapparebunt* Quod fircs uifapoi*natur in eo fitu cum diametro, ficut o b,idem iudicium apparebit,ficut patet
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Keywords: ., bo, bookauthorpeckhamjohnd1292, bookdecade1540, booksubjectoptics
