Exemple, 
2683 MÉMOIRES DE L'ACADÉMIE RoYALE 
= (b LES PET — dx, undè fit er = ; 48 
confequenter x — /(b + f) — LIb — bl(n + 1), 
ego AF — Dl{n + 1) ; hoc valore in expreflione cele- 
ritatis fubftituto erit 
vu = LE [{utr) (ae EE) fn + 3). 
l{n+:) 
_— 1 . 
Eft verd e 7 Ido OUI 
Agbhb . 3 A S 
nn [u — 1{n + 1)], ergo celeritas maxima in Ferit 
= 20V EE [n — (0 + 1)], five 26€, ob 
numerum # valdè magnum. 
Si a — 20 pad A5, ent 210 & 21 
1200, undè fit altitudo maxima À — 19200 ped. 
altitudo celeritati maximæ refpondens AF — 112 ped. 
celeritas maxima 64 ped. uno minuto fecundo & tempus 
afcenfüs 10/ 32”. 
