LAMINARVM ELASTICARVM. 4*73 



fuftinere vim B^ = G, politoque vt ante ^=:^> 

 ficri oportet 



- ?-|^(Afin.^-Bcof.^ + Cf^-D.^-0+G=o, 



ita vt iam cognofcamus hanc vim B |3 quae erit 



G rr Kf<;.^^cof 0n(Afin.?-Bcof.^ + Ctf^-DrO, 

 deinde autem momentum harum virium , neceflario 

 hic debet euaneicere , quia enim lamina circa B li- 

 bere mobilis cft, nulium momentum incuruans hic fta- 

 tui poteft , erit ergo : 



Aco£^-{-Bfin.^-C/-D^-^= o 

 denique hic manifefto eflc debet j:::o, tndc fit 



Acor^-f-Bfin.^-4-C^^-hD<f-^r=o 

 ex quibus duabus poftremis aequationibus ftatim fiuit 



Acof<-4-Bfin.^— o et Ctf^-i-P^-^=:o, 

 ©X qua poftrema fit 



C r: ^-^ ct D iz - tf^ , 



qui valores infuper in linsolam paruam fiint ducen- 

 di , vt applicatae y fiant lineares ct fimul inftnitfr 

 paruae , hinc ergo colligitur 



quibus vaioribus fubftitutis prodibit fequens aequatio 

 oc=tf-^(cor^-4-fin.^)-^^(cof.^-fin.^) fiue 

 _ ^ ^-e-^ . cof.<?-ffin.^ 



=> ^ ^^4-^— s' cof.4 — fin.4' 



formiila per redudiones notiflimas redit ad hanc 

 ^'^:=:Tang.{ie-4-<). 

 Tom.XVII.Nou.Comm. Ooo Hinc 



