38(5 



DE LENTIBVS 



f 14. Progrcdiamur igitur vlterius, ac videa- 

 mus, quomoJo etiiim ulttram conditionem, ex aper- 

 tura lentium oriundum di.lU"ui conueniat , et quia 

 duo vitri genera liic in conriderationcm veniunt, prg 

 -vtroque certos numcros , quibus ia calculo eft opus 

 apponamus 



Pro vitro coronario 



IX. — o, 9^75" 



y — o, 2194 



^ rr o> 2 266 



(T ~ I, 66oz 



r = o, 9252 

 cr ? — I, 4335 

 /(0- - ^1 = 0, 15^4-83 

 /r zzg, 9662355 



Pro vitro cryn:\lIino 



p.' — o, 8724 

 v' — o, 2529 



e 



o, 1413 



0-' =r I, 5827 

 t' — o, 8775 



0-'-^'^ 1,4414 



/a-'-^') — 0,1587845 

 /t' ==9,94324.71 



vnde porro in fubfidium calculi (cqucntib, colligan- 

 tur hi logarithmi 



/f^_l — 9,9461755 



/v' — 9, 34i-5^<^ 

 /v' — 9, 4029488. 



§. 15. Quia Icns fecunda cryflalHna Ttrinque 

 fupponitur aequc concaua , ft eius numerus arbitra- 

 ritis ponatur — X' erit 



yV-i='^\^-!),vbieft/i^f:'— 0,215537+ 



Vnde elici debet valor numcri A' , deinde fi pro len- 

 te prima ponatur numerus arbitrarius —X, eritcius 



. Radius faciei antcrioris — 



_ .T-/X— I 



Radius faciei pofteriotis — -^=^' 



^ A H-T V X — I. 



At 



