AST 
  
TEA aai gl M 
  
  
  
  
  
  
e eie. 
  
  
  
  
Int nme NL 
   
  
  
  
  
  
  
      
    
   
  
   
  
   
  
   
     
  
  
  
  
  
  
   
C1 
cU 
\ 
\ 
P 2d 
  
of the directions emerging from V, and passing through the two passage points Py, 
and P,,,,4 to be determined. The system is solved by iteration; quite quickly if an ee 
tronic computer is used. 
4th. Computation of the co-ordinates 
X Y Zp ire and XpGrne Ypat+ne Zeasnd : 
of the two new passage points P,,,,, and P(,,,,, by direct intersection from the i 
points V; and V,,,; and computation of the director cosines 
P(i+1)s? P(i+1)s? 
Q (i.-2)8» Y (i..2)s» 8 (i4+2)s 
Aii+2)a l(i+2)d S(i+2)d 
; ints Y,,,2 
of the rays V;,, P(,,5,, and V;,, P(,3,, emerging from the control points Va 
I : ranh (7: 
passing through the passage points P 9), @Nd P(1 4 954 at the following photograph 
Y : em «novi 
The equation system considered in the 3rd step above is the following; In it etr 
quantities are identified by a superimposed point. 
Le. + u? 
Ss 
= 2 
F u?ia 
18 
v2. —1 i 
b 
d- v3 —1 
  
The e 
wsines of 
{he corner 
ABCD,E 
ag Y, 1 
similar cor 
determine 
fedron anc 
leen t] 
To sol 
first appre 
unsiderat; 
twelve dir 
is also 
issigned t 
The s 
ply to t 
own ter 
9 that th, 
folowing - 
&ualizati 
Siperimpo