<j7a' DE LATITVD. VENERIS 



O M rr ^- V f (s - a) (s - b) U - c) , 



quam formulam pei' Logarithmos facile coitiputare 

 licet. liitienta autem O M, crir 



AM=^"^^(OA^-OM?)-y(OA+OM)(OA-OM) 

 fimiliqiie modo 



BAl — V(OB + GM)fOB-OM). 



Caetcnim ct alia via hoc negotium exfequi licet , 

 quaeretido piimum fegmenta A M et B M , tumque 

 iude OM, fi cnim difTcrentia fegmentorum AM 

 et B M dicatnr p, habebitur ob 



OA^-OB^—AM^-BM^, {a-^b){a—b)=:cp 

 ideoque 



tum vero erit 



A M rr : f + ; p et B M = L <: - 1 p , 



ct deniqiie fiet 

 OM-V(OA+AM)(OA-AM)=V(OB+BM;;oB-BM). 



Quamuif aute-rii poftcrior Mcthodus, priorc aliquan- 

 to vidcatur ftcilior , hanc tamen pracferendam eflc 

 ccnfuirrius , quia verificationcm quandam calculi fe- 

 cunn ferj-e cen((jnda cft , dum vtraque obfcruatio pro 

 tcmpore medii tranfitus eundem valorem cxhibcre 

 dcLct , quod commodum poHcriori operatione obti- 

 nai ncqnit , nifi valor lincae O M dnplici modo 

 qr.acrarnr , quo antcm facflo , prior operandi modus 

 huic brcuitatc nihil cedcrc vidctur. Cactcrum ficilc 



intelli- 



