6i 
vel, (quoniam evanescit integrale, posito f/=r et p = con> 
pletum autem fit quum y = R et p = P , ) 
7T 
zz,7r(PR z —‘P' r *) — — Rv"(Rv" — rv') 
— Ä»Vr(i+-^-=) [%.%>. 7 
» 2g r 
t/' 2 r* r 
0 + — 
42 P 2 R z r 2 
4gP 4gP 
Pressio in areolam DOD' est cn P in 0 } decrescit autem 
versus D. Lege autem hujus imminutionis ignotâ, supponatur 
pressio A in puncto quodam interjacente , cujus distantia ab O 
sit = Z, hacce analogia determinari : (PJ 1 — p) : r : : P$ — * 
A : z 5 atque adeo tota pressio 
= 7 f r 2 p -}- y 7t r 2 (P<^ — p'). 
Pressio in totum resistentiae planum AÅ in metr. cub. ae- 
ris atrnospliærici æsthnata, evadit itaque 
7T „ 9? rt/ . 
= x R‘P +• j(P<S — 1 ('— 57 -) 
7T v' 2, ri/ t/ 2 P v 2 v' 2 2 r 2 r 2 — - P 2 
~ )V ° ê ' J W , 'ï : ~ h 4gp( , ~ i ~ïgP ) ÄV* 
Tota autem pressio in partem exteriorem est = 71 R 2 P. 
Si illa hac subtrahatur, supererit valor suctionis, quam planum 
intus versus fluxum aëris patitur 
) ( '!°r • 
R i 
%• r - 
V 
V 
n 
srjP >2 ^~ U?) 5 
r 2 4gP^ 4gP‘ K P* 
Z=.7sR z . 
V 
2g V 
i rv' t/ 1 
