ed on 
method 
ion of 
points 
ements 
nation 
1 the 
es in 
es of 
he aim 
shell 
camera 
ld be 
ith an 
1991). 
es of 
esult, 
mputer 
{0D 
les of 
both 
ndence 
cisive 
icture 
with 
ations 
metric 
ammera 
with 
al and 
ints on 
‚ity of 
ethod. 
ed in 
metric 
, there 
etical 
ince on 
lation 
scale 
urface 
nts of 
urface 
ase of 
tower 
+» the 
proper 
ulties 
while 
ternal 
ialist 
n way, 
jivocal 
1lowed 
ase of 
lerably 
oss of 
ed in 
ion of 
signal 
the 
- 
    
real shape of 
  
   
   
; | external surface 
E | 
8 
N theoretical shape | 
! of hyperbolic surface 
| TET. 
, | theoretical shape \ 
J of external surface 
| \ 
| 
/ 
   
1 
V 
200 m \ > 
1 scale of theoretical 
hyperbolic surface 
= 
HO 
C 
  
/ 
0 60 120mm 
+22mm >, Lui scale of imperfection 
Fig.2. Theoretical and real shape of cooling tower observed from one camera stand. 
> ANA 
NSA ZZ = 
— 
= = 
AAA A ARCET 
AZ FrE ZZ ZZ 
SS —— 
= 
ZI I) 
ZELLE EZ FELL ZZ FE CZ 
Fig.3. Shell deformation. 
331