RADIORVM DIVERSICOLORVM. 175 



tum pro quacunquc alia rcfraiflionc mcdia M : i 

 iiabcbitur 



Rcfracflio rubra — M''"''"':i et 



rcfrjdio violacea — M^'"'^": i. 



Cum igitur conftct in tranfitn cx acre in vitrum 

 elTc m—i,5S, r— 1,54. ct -y— i,5<J erit 



1 m •-" 195J317 — * aji *'*■ 

 — I9JII*8 T 4- -■-. 



2 JTl — " 1933117 - — * I »3*J* 



Hinc medium fumcndo , et loco fradionis «V fcri- 

 bendo littcram $ m gencre aflirmare licet , fi ia 

 tranfitu quocunque fuerit rcfradio media zz M : i , 

 forc rcfradionem rubram — M'~^ : i et violaceam 

 = M'-^^: I. 



Coroll. I. 



20. Cum fit $ fradio tam exigua nempo 

 ^zTsV erit fatis cxadc M*=i-K^/M et M-*:=i 

 — $/M denotantc /M lo^arithmum hyperbolicum 

 ipfius M; vnde prodit pro refr.i<flione media z:M:« 

 proximc : 



refracflio rubra zzM — ^M/M=:M — sVM/M : i 

 refradio violacca c: M+^^M/M — M + iVM/M: i. 



Coroll. 2. 



ai. Logarithmi autcm hypcrbolici obtinentur, 

 fi vulgares in tabulis exhibiti muItipHcentur per 

 2,30258. Hinc fi in his formuhs logarithmis 



vulga- 



