[ 78o ] 
AT iis parallels, & per Mm , Nn, re&ae MT \ nt. 
Jam nA:At::nr(velm R): r N :: mRx M A ‘ 
r N xAM ::m R x M A : MR x A N ; ; M A x 
Am : AN* AT, fed in ultima ration cm A = MA, 
& T A normalis ad M N , quare n A : At : : 
M A* ’ A N X AT fi nunc ex M ducatur per circuit 
centrum F, reda MF producenda, donee, redae TA 
item produdae occurrat in G , id eft, ufque ad circuli 
peripheriam, erit MA Z = TAx AG ; quapropter 
nA : At : : AG : A N ; deferibatur igitur femicir- 
culus per G, & qui fecabit redam AT in t , ex 
quo duda reda / iV erit tangens ad curvam, ad quam 
infuper reda NG eft normalis; hinc jungantur MO, 
cui ex N ducatur parallela, quae tanget curvam. 
Hie obiter notandum puto hanc ducendarum tan- 
gentium methodum probe convenire pluribus curvis. 
Sit A B, Fig. 2. Conchois Nicomedaea: Tunc 
(fuppofita fuperiori praeparatione) BR:Rt::BR, 
(vel cr): Rb :: cr X CR : Rb X C R, (vel rCx 
RR) : : CR Z : TR xR R, unde dcducitur fuperior 
conftrudio. 
Reda longitudinis datae Fig. 3. CRB, extremitate 
C radens redam CR)T ad R) A normalem, Temper 
tranfeat per pundum P datum in ipfa R) A, & ita 
curvam AB gignat. 
Superiorem praeparationem, & ratiocinium huic 
aptans habebis BR : R t : : b R (r c) : R B : : c r x 
CR : RBxCR (BR Xr C) : :CR 7 : BRxRT, 
ut fupra. Piget plura referre. 
Caetcrum methodus de maximis, & minimis dat 
maximam ordinatam = & ejus abfeiftam = ~ yC 
4 4 
Poflct codcm pado inveftigari abfeiftarum maxima ; 
fed 
