( 391 ) 
hj? ad? Q 
Ger tier its a 
the attraction which is to be calculated may be represented by: 
oo u== 00 
| hj? do a oh ( aie a ue de RN i 
ES toe = a — 6 
: (e+ m5 Ln EE 1.2 el es AT me oe 
0 u=0 
f -eawe +m = ew) 
cv) 
uo ue 
do 
kn wu th) = jue — WW (u +h) D| — — fw (u + hj) du 
dad ie ie 
The integrated term is zero for the two limits. 
u 0 UZ 
f u* dg : ; uw dy F 
|t tete | #0 a] + 
u) u—0 
== 
w (uw + hy) u du 
Uil 
+ oe je 
The integrated term is here also zero for the two limits. 
The integral beeomes therefore: 
f" dg re h,? do 1 (iy) a, ya 
ede Th aks i 
e+ hy ey Ta) u |o w(h wu + hij) du 4 
0 (1) @) (3) (1) u=0 (2!) 
Jie, 
do (C 
Ff Wu hj) au| 
dh? 
u=0 (37) 
feae =e f WO diy = a mies, kh €) 
0 
0 
